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2009 Hangzhou Workshop 2009 Hangzhou Workshop on Quantum Matte ron Quantum Matte r
PROGRAM
October 12-15, 2009
Run-Run Shaw Science Building, Level 1, Zhejiang University and Zhejiang Hotel
Organized by
Department of Physics, Zhejiang UniversityDepartment of Physics and Astronomy, Rice University
Sponsored by
Zhejiang University
Rice University
Max-Planck Institute for Chemical Physics of Solids
University College London
University of Science and Technology of China
Hangzhou Normal University
Key Research Subjects, Ministry of Education of China
Program of Changjiang Scholarship and Innovation Research Team
973 Program, Ministry of Science and Technology of China
National Science Foundation of China
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Table of Contents
Front cover …............................................................................................................................ 1
Introduction to the 2009 Hangzhou Workshop …..................................................................... 3
International Collaborative Center on Quantum Matter …....................................................... 5
Workshop Program …............................................................................................................... 6
Abstracts ….............................................................................................................................. 11
List of Participants …............................................................................................................... 42
Attendee Guide ….................................................................................................................... 50
Campus and Hotel Maps …..................................................................................................... 51
Blank Pages for Notes …..........................................................................................................55
Back cover …........................................................................................................................... 60
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Introduction to the 2009 Hangzhou Workshop
Purpose
The primary purpose of the Hangzhou workshop is to explore the long term institutional collaborations between Zhejiang University, Rice University, and a number of other institutions from Asia, North America and Europe, in the area of quantum matter. This frontier subject concerns modern condensed matter and atomic systems, in which quantum correlation and quantum coherence strongly influence their physics properties. The first such workshop was advocated by President Wei Yang of Zhejiang University and President David Leebron of Rice University, and was held in Hangzhou in 2006. The 2009 workshop will bring experimentalists and theorists in this area together from countries including China, USA, Germany, UK, and elsewhere. The workshop will address newly discovered quantum phases and novel quantum phenomena in strongly correlated systems, nanostructures and cold atoms. It also aims to stimulate and encourage more junior scientists and students to engage in research on quantum matter.
Topics
The 2009 Workshop will cover the following topics:
1. New superconductors and unconventional superconductivity,
2. Heavy fermions and quantum criticality,
3. Novel quantum phenomena in cold atoms and molecules,
4. Electron correlations in quantum nanostructures and related low-dimensional systems,
5. Non-equilibrium quantum phenomena and quantum information approaches to many-body systems.
National Advisory Committee
Chang-De Gong (Nanjing University/Zhejiang Normal University)
Xian-Tu He (Zhejiang University, Honorary Chair)
Minxing Luo (Zhejiang University)
Gao-Xiang Ye (Zhejiang University/Hangzhou Normal University)
Lu Yu (Institute of Physics, Chinese Academy of Sciences, Beijing)
Yu-Heng Zhang (University of Science and Technology of China, Hefei)
Hang Zheng (Shanghai Jiaotong University, Shanghai)
International Organizing Committee
Gabriel Aeppli (University College London)
Xian-Hui Chen (University of Science and Technology of China, Hefei)
Qimiao Si (Rice University, Co-Chair)
Frank Steglich (Max-Planck Institute)
Xin-Cheng Xie (Institute of Physics, Chinese Academy of Sciences, Beijing)
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Zhuan Xu ( Zhejiang University )
Huiqiu Yuan (Zhejiang University)
Fu-Chun Zhang (Hong Kong Univ./Zhejiang Univ., Co-Chair)
Local Organizing Committee
Guanghan Cao (Zhejiang University)
Qijin Chen (Zhejiang University)
Jianhui Dai (Zhejiang University)
Minghu Fang (Zhejiang University/Hangzhou Normal University)
You-Quan Li (Zhejiang University)
Zhuan Xu (Zhejiang University)
Heping Ying (Zhejiang University)
Huiqiu Yuan (Zhejiang University)
Sponsors
Zhejiang University Rice University
Co-sponsors
Max-Planck Institute of Chemical Physics in Solids University College LondonUniversity of Science and Technology of China Hangzhou Normal University
Other Financial Supports
Key Subjects of Theoretical Physics, Ministry of Education of ChinaThe Program of Chang Jiang Scholarship and Innovation Research Team National Science Foundation of ChinaY.C. Tang Disciplinary Development Foundation, Zhejiang University.
Venue
The 2009 Workshop will be held at the Yuquan Campus of Zhejiang University (October 12) and Zhejiang Hotel (October 13-15).
Website
http://zimp.zju.edu.cn/~iccqm/workshop2009/ .
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Introduction to
International Collaborative Center on Quantum Matter
Background
Zhejiang University (ZJU) in China and Rice University (RU) in USA bear many similarities, both geographically and in terms of the emphasis each university places on science and technology. The complementary strengths with the strong relationship between the leadership at university level of both sides have presented an opportunity to create a virture research center that brings together faculty research clusters at both institutions and leverages the combined efforts to engage additional international faculty collaborations. Preliminary efforts for such collaboration have been made over the past several years, particularly in the area of Quantum Matter. This area is a frontier subject in physics and materials science, with major impacts on the science and technology of modern society.
ZJU-Rice Agreement
On July 3, 2008, the Memorandum of Understanding between Zhejiang University and Rice University was signed by President Wei Yang and President David W. Leebron in Hangzhou. According to the Memorandum, an International Collaboration Center on Quantum Matter (ICCQM) will be established on the Zhejiang University campus in October 2009. The goal of the ICCQM is to enhance the long-term international research collaborations between Zhejiang University and Rice University, along with other leading international institutions in the broad area of quantum matter. The cooperation will include, but not limited to, collaboration in research, conducting joint workshops, and mutual research visits among faculty and students. Both universities agree to support efforts associated with the ICCQM and seek the participation of other institutions in order to create a critical mass in sustaining a network of substantive collaborations among the individual participating research groups. The formation of the ICCQM will be announced at the 2009 Hangzhou Workshop on Quantum Matter.
Participating Institutions
Max-Planck Institute of Chemical Physics in Solids University College LondonUniversity of Science and Technology of China Hangzhou Normal University
Organizations
The ICCQM will consist of physicists from participating institutions, including co-directors Professors Fu-Chun Zhang and Qimiao Si, representing Zhejiang University and Rice University, respectively. It has three committees: the International Advisory Committee, the International Academic Committee, and the Executive Committee.
Website
The ICCQM has a website at http://zimp.zju.edu.cn/~iccqm/.
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ProgramProgram
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Workshop Program
10/11/2009
13:00 - 20:00 Registration (Locations: Zhejiang Hotel and Lily Hotel)
10/12/2009 Location: Run-Run Shaw Science Building, Zhejiang University (Yuquan Campus)
8:00 - 12:00 Registration
Session 1 Opening. Chair: Fu-Chun Zhang
8:40 - 9:30 Welcome, inauguration of ICCQM, and group photo
9:30 - 9:55 Frank Steglich Global phase diagram of the quantum critical heavy-fermion metal YbRh2Si2
9:55 - 10:20 Gabriel Aeppli Silicon-based quantum life
10:20 - 10:45 Piers Coleman Composite pairing and avoided criticality in the highest temperature Heavy Fermion Superconductors.
10:45 - 11:15 Tea Break
Session 2 Heavy fermions and quantum criticality (1) . Chair: Peter Woelfle
11:15 - 11:40 Hilbert v. Loehneysen Magnetic quantum phase transitions at absolute zero
11:40 - 12:05 Oliver Stockert Magnetic excitations as driving force of superconductivity in CeCu2Si2
12:05 - 12:30 Steffen Wirth Magnetotransport in heavy fermion metals CeMIn5: the influence of antiferromagnetic fluctuations
12:30 - 14:00 Lunch
Session 3 Iron pnictides (1): Materials. Chair: Tao Xiang
14:00 - 14:25 Xianhui Chen Superconductivity and phase diagram in high-Tc pnictide superconductors
14:25 - 14:50 Zhiqiang Mao Phase diagram of Fe1+y(Te1-xSex ): evolution from antiferromagnetism to superconductivity
14:50 - 15:15 Guanghan Cao Superconductivity and quantum criticality in phosphorus-doped ferroarsenides
15:15 - 15:40 Desmond F. McMorrow
Strong momentum-dependent doping-induced renormalizations of optical phonons in single crystals of SmFeAs(O1−xFy)
15:40 - 16:05 Tea Break
Session 4 Iron pnictides (2): ARPES and others. Chair: Xianhui Chen
16:05 - 16:30 Wei Bao Neutron scattering study on structure, magnetic order and excitations in the Fe-based superconductors
16:30 - 16:55 Dong-Lai Feng Recent ARPES results of several iron-based systems
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16:55 - 17:20 Xingjiang Zhou Electronic evidence of unusual magnetic ordering in a parent compound of FeAs-based superconductors
17:20 - 17:45 Michael Nicklas Interplay of 4f magnetism and superconductivity in EuFe2As2
18:00 - 20:00 Reception
10/13/2009 Location: Zhejiang Hotel
Session 5 Theory of correlated electrons (1). Chair: Piers Coleman
8:30 - 8:55 Elihu Abrahams Magnetism and correlations in pnictides and fullerines
8:55 - 9:20 Tao Xiang Second renormalization of tensor-network states
9:20 - 9:45 Qimiao Si Towards a global phase diagram of the magnetic heavy fermions
9:45 - 10:10 Guang-Ming Zhang Universal linear-temperature dependence of static magnetic susceptibility in iron-pnictides
10:10 - 10:35 Tea Break
Session 6 Quantum simulations/computations. Chair: Stefan Kirchner
10:35 - 11:00 Zhong-Yi Lu Atomic and electronic structures of ternary iron arsenides AFe2As2 (001) surfaces (A=Ba, Sr, or Ca)
11:00 - 11:25 Zhong Fang Applications of LDA+Gutzwiller method for correlated electron systems
11:25 - 11:50 Xi Dai Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface
11:50 - 12:15 Xiao-Qun Wang Exact results on the minimal conductivity of graphene at zero gate-voltage
12:30 -14:00 Lunch
Session 7 Theory of correlated electrons (2). Chair: Guang-Ming Zhang
14:00 - 14:25 Peter Wölfle Electron spin resonance in Kondo systems
14:25 - 14:50 Zheng-Yu Weng Spin-roton excitations and Tc formula for the cuprate superconductors
14:50 - 15:15 Qiang-Hua Wang Signatures of symmetry and relative sign of the pairing gaps in a multiband superconductor in tunnelling
15:15 -15:40 Tea Break
Session 8 Quantum Hall effects. Chair: Zheng-Yu Weng
15:40 - 16:05 Xin Wan Probing non-Abelian anyons in the quantum Hall interferometry
16:05 - 16:30 Xin-Cheng Xie Dephasing and disorder effects in quantum spin Hall effect
16:30 - 16:55 Rui-Rui Du Quantum spin Hall effect in InAs/GaAs quantum well
16:55 - 17:20 Jian-Xin Li Quantum phase transition in Hall conductivity on an anisotropic kagome lattice
17:30 - 19:00 Dinner
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19:15 - 21:30 Excursion to Songcheng Park
10/14/2009 Location: Zhejiang Hotel
Session 9 Cold atoms. Chair: You-Quan Li
8:30 -8:55 Han Pu Optical cavity-induced bistability in spinor Bose-Einstein condensate
8:55 -9:20 Wu-Ming Liu Non-Abelian Josephson effect and half vortex of cold atoms in traps and microcavities
9:20 - 9:45 Qijin Chen Radio frequency spectroscopy in atomic Fermi gases
9:45 - 10:10 Tea Break
Session 10 Nano-Structure and mesoscopic. Chair: Xin-Cheng Xie
10:10 - 10:35 Junichiro Kono Low-energy dynamics in single-walled carbon nanotubes
10:35 - 11:00 Christian Ruegg Luttinger-Liquid Physics and Bose-Einstein Condensation in Quantum Magnets
11:00 - 11:25 Douglas Natelson Electronic correlations in single-molecule and other nanojunctions.
11:25 - 11:50 Andrew J. Fisher Mixed coherent and incoherent dynamics in strongly correlated quantum systems
11:50 - 12:20 Carol Quillen, Rice's Vice Provost, and Mark Davis, Assistant to the President
12:20 - 13:50 Lunch
13:50 - 17:45 Excursion to the West Lake
18:00 - 21:00 Banquet
10/15/2009 Location: Zhejiang Hotel
Session 11 Heavy fermions and quantum criticality (2). Chair: Frank Steglich
8:30 - 8:55 Joe D. Thompson Superconductivity in the heavy-fermion systems CeCoIn5 and CeRhIn5
8:55 - 9:20 Manuel Brando Kondo-cluster-glass state near a ferromagnetic quantum phase transition in CePd1-xRhx
9:20 - 9:45 Huiqiu Yuan Superconductivity in heavy fermion compounds and iron pnictides (chalcogenides): A study under extreme conditions
9:45 - 10:10 Stefan Kirchner Berry phase effects in quantum critical Kondo breakdown scenarios
10:10 - 10:35 Tea Break
Session 12 Transition metal oxides. Chair: Gabriel Aeppli
10:35 - 11:00 Ying Liu Pairing symmetry of Sr2RuO4 probed by tunneling and phase-sensitive measurements
11:00 - 11:25 Toby Perring Spinons and covalency effects in the one-dimensional spin-1/2 cuprate antiferromagnets Sr2CuO3 and SrCuO2
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11:25 - 11:50 Andreas Rost Entropy landscape of phase formation in the vicinity of quantum criticality in Sr3Ru2O7
11:50 - 12:15 Hai-Hu Wen Specific-heat measurement of residual superconductivity in the normal state of underdoped cuprate superconductors
12:30 - 14:00 Lunch
Session 13 Correlated electrons and BEC. Chair: Changde Gong
14:00 - 14:25 Jiangping Hu Magnetism and pairing symmetry in the iron-based superconductors
14:25 - 14:50 Yeong-Ah Soh Spin Density Wave effects and unusual temperature dependence of magneto-transport in Chromium
14:50 - 15:15 You-Quan Li Multi-component BECs
15:15 -15:40 Tea Break
Session 14 Correlated electrons and concluding remarks. Chair: Lu Yu
15:40 - 16:05 Chandra Varma Considerations on the transition temperatures of electronically induced superconductivity
16:05 - 16:30 Fu-Chun Zhang Magnetic properties of helical metal
16:30 - 17:30 Lu Yu, Elihu Abrahams, et al --- Summary and concluding remarks
18:00 -19:30 Dinner
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AbstractsAbstracts
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Global phase diagram of the quantum critical heavy-fermion metal YbRh2Si2
F. Steglich
MPI for Chemical Physics of Solids, Noethnitzer Str. 40. 01187 Dresden, Germany
In the heavy-fermion metal YbRh2Si2 a quantum critical point (QCP) has been established by driving a continuous antiferromagnetic (AF) phase transition from TN ≈ 70 mK at B = 0 to TN = 0 via application of a tiny magnetic field Bc (⊥c) ≈ 60 mT [1]. New results on the Hall effect [2], magnetic Grüneisen ratio [3] and thermoelectric power [4] support the conclusion drawn from earlier studies [5, 6] that this AF QCP coincides with a Kondo-breakdown QCP or Mott transition, selective to the Yb3+ - 4f states. In a recent investigation, (positive and negative) chemical pressure was applied to YbRh2Si2 to explore the evolution of its B-T phase diagram under changes of the unit-cell volume: Clear signatures of the Kondo-breakdown QCP were observed within the magnetically ordered phase under volume compression (i.e., Co substitution for Rh) [7]. On the other hand, under slight volume expansion (doping with 2.5 at % Ir) the AF instability and the selective Mott transition were found to still coincide at Bc (⊥c) ≈ 40 mT. For 6 at% Ir doping, however, AF order appears to be largely suppressed (TN
< 20 mK), while the Kondo-breakdown QCP remains virtually unchanged. For this composition, a new type of low-T spin-liquid phase shows up in a finite range of magnetic fields [7]. Further ongoing studies concerning the interplay between the selective Mott transition and incipient AF order in this material will be briefly reviewed.
In collaboration with:M. Brando, S. Friedemann, P. Gegenwart, C. Geibel, S. Hartmann, S. Kirchner, C. Krellner, M. Nicklas, N. Oeschler, Q. Si, O. Stockert, Y. Tokiwa, T. Westerkamp and S. Wirth.
1. O. Trovarelli et al., Phys. Rev. Lett. 85, 626 (2000).2. S. Friedemann et al., to be published.3. Y. Tokiwa et al., Phys. Rev. Lett. 102, 066401 (2009).4. S. Hartmann et al., to be published.5. S. Paschen et al., Nature 432, 881 (2004).6. P. Gegenwart et al., Science 315, 969 (2007).7. S. Friedemann et al., Nature Phys. 5, 465 (2009).
Silicon-based quantum life
Gabriel Aeppli
Department of Physics and Astronomy, University College London, London, UKEmail: [email protected]
We show how simple silicon based materials host quantum phenomena of interest to both condensed matter and atomic physicists, ranging from non-Fermi liquids (Nature 454, 976 [2008]) to controllable Rydberg states (PNAS 105, 10649-10653 [2008]).
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Composite pairing and avoided criticality in the highest temperature Heavy Fermion Superconductors.
Piers Coleman
Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Rd., Piscataway, NJ, 08855, USA.
The discovery in 1996 of superconductivity at 0.2K near a magnetic quantum phase transition in CeIn3 opened a new dynasty of superconducting heavy electron materials, with many peculiar parallels to cuprate superconductors. In 2000, the introduction of additional layers of XIn2, led to the discovery of the so-called "115" superconductors, with a tenfold increase in Tc [1]. By 2002, the replacement of Ce by Pu, drove the Tc up by an additional order of magnitude to 18.5K [2]. The recent discovery of a second material in this family has further deepened the mystery.
In this talk I'll discuss the "high temperature" heavy fermion superconductors, CeCoGa5, PuCoGa5 and NpPd2Al5. These materials radically challenge the way we think about strongly correlated superconductivity. The way these materials directly transition from Curie paramagnets into anisotropic superconductors suggests a central role of spin as a driver for heavy electron superconductors - not as the pairing glue - but as the central fabric of the condensate.
I'll discuss a model for superconductivity in these materials in which the superconducting condensate involves formation of composite pairs between spins and conduction electrons[3]. I will present our most recent, unpublished work, and discuss the possibility that the composite pairing model may be able to account for the observation of a quantum critical point in the vicinity of the upper critical field in CeCoIn5.
[1] H. Hegger, C. Petrovic, E. G. Moshopoulou, M. F. Hundley, J. L. Sarrao, Z. Fisk, and J. D. Thompson, ''Pressure-Induced Superconductivity in Quasi-2D CeRhIn5'' , Phys. Rev. Lett. 84, 4986-4989 (2000).
[2] J. L. Sarrao et al. , ``Plutonium-based superconductivity with a transition temperature above 18 K", Nature (London) 420, 297-299 (2002).
[3] Rebecca Flint, M. Dzero, P. Coleman, "Heavy electrons and the symplectic symmetry of spin.", Nature Physics 4, 643 - 648 (2008).Nature Physics,
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Magnetic quantum phase transitions at absolute zero
Hilbert v. Löhneysen
Physikalisches Institut, Universität Karlsruhe, Karlsruhe Institute of Techology (KIT), D-7128 Karlsruhe, Germany, and
Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany
In a number of metallic systems with strong electronic correlations, long range magnetic order can be tuned to zero temperature by an external parameter such as pressure, chemical composition or magnetic field. At such a quantum phase transition (QPT), the quantum energy of critical fluctuations becomes a relevant energy compared to the thermal energy, leading to unusual non-Fermi-liquid (NFL) behavior in thermodynamic and transport properties, and possibly to new phases. We will discuss examples of unusual features near a QPT: (i) Highly anisotropic magnetic fluctuations in the heavy-fermion system CeCu6-xAux observed by inelastic neutron scattering arise when approaching the QPT occurring at x = 0.1, despite the fact that long range-incommensurate order for x ≥ 0.15 is three-dimensional. The QPT in this system can be tuned by Au concentration, hydrostatic pressure, or magnetic field, which offers the opportunity to elucidate the role of the tuning parameter leading to different types of critical scaling. Further, the fate of the Kondo effect, being at the origin of heavy-fermion behavior, will be explored with photoemission spectroscopy. (ii) In MnSi the QPT can be tuned by hydrostatic pressure p. The long-wavelength helical magnetic order at p = 0 (wavelength 180 Å) retains its periodicity when approaching the QPT but loses its orientation, as observed via elastic neutron scattering under pressure. This “partial order” is reminiscent of orientational order in chiral liquid crystals. We investigate the possibility of partial order at ambient pressure above Tc. (iii) While bulk LaCoO3 is in a low-spin S = 0 state for T → 0, tensile strain on epitaxial LaCoO3 films exerted by the substrate induces ferromagnetism. The possibility of a QPT obtained by strain tuning in this system will be discussed.
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Magnetic excitations as driving force of superconductivity in CeCu2Si2
O. Stockert
Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Coexistence or competition of superconductivity and magnetic order remains an important issue in condensed matter physics. While conventional superconductivity is generally incompatible with magnetism, the magnetic 4f or 5f moments in heavy-fermion superconductors play a crucial role for the appearance of unconventional superconductivity. Similar to the high-temperature cuprate superconductors, spin excitations instead of phonons are thought to be involved in the formation of Cooper pairs. However, no common consensus exists about the magnetic origin of Cooper pairing in unconventional superconductors.
Using inelastic neutron scattering we show that a clear spin excitation resonance is present in the superconducting state of the prototypical heavy-fermion compound CeCu2Si2, for the first time observed at an incommensurate wave vector in a heavy-fermion superconductor. Our results demonstrate that the spin excitations are highly relevant for the superconducting pairing in CeCu2Si2. In contrast to the cuprates with quasi-2D electronic structure, the observation of the spin excitation resonance in CeCu2Si2 with a 3D structure suggests that their appearance is a more general manifestation of unconventional superconductivity.
Magnetotransport in heavy fermion metals CeMIn5:the influence of antiferromagnetic fluctuations
S. Wirth
Max-Planck-Institute for Chemical Physics of Solids, 01187 Dresden, Germany
Heavy fermion metals are often characterized by a variety of relevant energy scales and competing interactions which may result in such fascinating phenomena as quantum criticality and unconventional superconductivity. Therefore, these materials have advanced to suitable model systems by means of which electronic interactions can be studied in detail. Here we focus on magnetotransport investigations of the heavy fermion metals CeMIn5 (M = Co, Ir) and CeCo(In1-xCdx)5. Pressure-dependent Hall effect measurements on CeCoIn5 exhibit a well developed feature that can unambiguously be related to spin fluctuations associated with the departure from Landau Fermi liquid behavior. We infer related, yet separate critical fields of the field-induced quantum phase transition and superconductivity. Magnetotransport measurements on CeIrIn5 indicate a precursor state to superconductivity. A model-independent, single parameter scaling of the Hall angle governed solely by this precursor state is observed. The relation of this precursor state to the so-called pseudogap in high transition temperature cuprate superconductors will be discussed. A detailed comparative scaling analysis indicates a weak scattering of the quasiparticles by magnetic excitations. These findings are corroborated by recent measurements on CeCo(In0.925Cd0.075)5, a material which exhibits local coexistence of antiferromagnetic order and superconductivity. For the latter material, the electronic transport in the paramagnetic regime measured down to 0.06 K is incompatible with Fermi liquid behavior.
This research is conducted in collaboration with S. Nair, M. Nicklas, O. Stockert, F. Steglich.J. L. Sarrao, J. D. Thompson, A. D. Bianchi, Z. Fisk and A. J. Schofield
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Superconductivity and phase diagram in high-Tc pnictide superconductors
X. H. Chen
National Laboratory for physical sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
We will talk about the discovery of superconductivity with Tc higher than 40 K in Fe-based superconductors SmFeAsO1-xF. Tc higher than McMillan limit of 39 K (the theoretical maximum predicted by BCS theory) definitely proves pnictide superconductors high-Tc superconductivity1,2. In this talk, we will review the progress of superconducting matierals in pnictide superconductors. We present the transport properties: resistivity, Hall coefficient and transport properties under high magnetic field. These results suggest a quantum phase transition around x=0.14 in SmFeAsO1-xFx system. A electronic phase diagram is proposed, and coexistence of superconductivity and spin-density-wave is observed in Sm-1111 and Ba-122 system. We show you the contrasting behavior between the region with coexistence of superconductivity and spin-density-wave and the region without the spin-density-wave ordering by high pressure, structure, high-magnetic field and muSR measurements.
In this talk, we will discuss the isotope effect. Density functional theory calculations indicate that the electron-phonon interaction is not strong enough to give rise to such high transition temperatures, while strong ferromagnetic and antiferromagnetic fluctuations have been proposed to be responsible. However, superconductivity and magnetism in pnictide superconductors show a strong sensitivity to the lattice, suggesting a possibility of unconventional electron-phonon (e-p) coupling. Therefore, it is of great importance to study the isotope effect on magnetic and superconducting transitions. We discuss the effect of isotopic substitution on the superconducting TC and spin-density wave (SDW) TSDW in SmFeAsO1-xFx and Ba1-xKxFe2As2 systems by either replacing 16O with the isotope 18O or substitution of 54Fe for 56Fe. Our results show that oxygen isotope effect on TC and TSDW is very little, expected by that FeAs layer is conducting layer and responsible for superconductivity. The iron isotope exponent αC=dlnTC/dlnM is about 0.35, being comparable with 0.5 for the full isotope effect in the frame of BCS theory. It shows definite and strong isotope effect in pnictide superconductors. Surprisingly, the iron isotope exchange shows the same effect on spin-density-wave transition as on superconductivity, especially leads to an apparent decrease in resistivity in SDW state, implying the correlation between superconductivity and spin-density wave and a strong magnon-phonon coupling. Our results indicate that electron-phonon interaction plays some role in the superconducting mechanism, but simple electron-phonon coupling mechanism seems to be rather unlikely because a strong magnon-phonon coupling is included3.
References:
1. Chen, X. H. et al. Superconductivity at 43 K in SmFeAsO1-xFx. Nature 453, 761-762 (2008).2. Liu, R. H. et al. Anomalous transport properties and phase diagram of the FeAs-based
SmFeAsO1-xFx superconductors. Phys. Rev. Lett. 101, 087001 (2008).3. R. H. Liu et al., A large iron isotope effect in SmFeAsO1-xFx and Ba1-xKxFe2As2, Nature 459,
64-67(2009).
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Phase diagram of Fe1+y(Te1-xSex): Evolution from antiferromagnetism to superconductivity
Zhiqiang Mao
Department of Physics and Engineering Physics, Tulane UniversityNew Orleans, LA 70118, USA
Iron chalcogenide Fe1+y(Te,Se) is the simplified version of Fe-based superconductors [1,2] and has a unique antiferromagnetic (AFM) structure in the parent compound [3,4]. In iron pnictides the propagation direction of the SDW-type AFM order is along the edge of the Fe square lattice [5-7], while the AFM order in chalcogenide Fe1+yTe propagates along the diagonal direction of the Fe square lattice and can be tuned from commensurate to incommensurate by changing Fe stoimechiometry [3]. Understanding the superconducting properties of this system is considered critical [8], owing to the unique magnetic properties in Fe1+yTe. In this talk I will first give a brief overview of the progress in studies of this material system, and then about our recent research results in this area. Our work has primarily focused on establishing a complete phase diagram for Fe1+y(Te,Se) and investigating the effects of Fe nonstoichiometry on superconducting properties of this system. We have made important progress in these studies. We found that that the long-ranged AFM order is gradually suppressed by Se substitution and disappears near 9% of Se, above which a short-range AFM order survives. Bulk superconductivity does not appear until Se content is greater than 30%. We also observed that excess Fe at interstitial sites of the (Te,Se) layers not only suppresses superconductivity, but also results in a weakly localized electronic state [9]. These effects were found to be associated with the magnetic coupling between the excess Fe and the adjacent Fe square planar sheets.
References:
[1] F.C. Hsu et al., Proc. Natl. Acad. Sci. USA. 105, 14262 (2008).[2] M.H. Fang et al., Phys. Rev. B 78, 224503 (2008). [3] W. Bao et al., Phys. Rev. Lett. 102. 247001 (2009). [4] S.L. Li et al., Phys. Rev. B 79, 054503 (2009).[5] C. Cruz et al., Nature 453, 899 (2008).[6] Q. Huang et al., Phys. Rev. Lett 101, 257003 (2008). [7] J. Zhao et al., Phys. Rev. Lett. 101, 167203 (2008).[8] A.V. Balatsky and D. Parker, Viewpoint, Physics 2, 59 (09)[9] T.J. Liu et al., arXiv:0904.0824
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Superconductivity and quantum criticality in phosphorus-doped ferroarsenides*
Guanghan Cao, Jianhui Dai, and Zhuan-an Xu
Department of Physics, Zhejiang University, Hangzhou 310027, China
Over one year ago, new class of high temperature superconductors were discovered in some FeAs-layer-based materials via doping charge carriers using the heterovalent substitutions like F-for-O and K-for-Ba. The parent compounds, e.g., LnFeAsO (Ln=lanthanides) and AFe2As2 (A=Ba, Sr, Ca and Eu) have been recognized as a spin-density-wave antiferromagnet. Thus the appearance of superconductivity resembles the case in cuprates, where superconductivity was induced by doping charge carriers in a CuO2-sheet-based Mott insulator.
Here we report the realization of superconductivity in the Fe-based parent compounds by the P-for-As substitution--without doping charge carriers. Besides, quantum criticality was also demonstrated in some systems. The main observations are listed as follows:
1) Bulk superconductivity at 10 K in LaFeAs1-xPxO at x=0.3.2) Bulk superconductivity at 4 K in SmFeAs1-xPxO at x=0.5.3) Bulk superconductivity at 30 K in BaFe2(As1-xPx)2 at x=0.3, where non-Fermi liquid
behavior shows up.4) Coexistence of superconductivity and ferromagnetism in EuFe2(As1-xPx)2 at x=0.3.5) In stead of appearance of superconductivity, two quantum critical points were
demonstrated in CeFeAs1-xPxO at x=0.37 and 0.92, respectively.The above results suggest close relation between the superconductivity and quantum
criticality, therefore, hint the superconducting mechanism with spin fluctuations.
------------------------*This work is supported by the NSF of China and the National Basic Research Program of China (No.2006CB601003 and 2007CB925001).
References
[1] Z. Ren et al., Phys. Rev. Lett. 102, 137002 (2009).[2] C. Wang et al., Europhys. Lett. 86, 47002 (2009).[3] S. Jiang et al., J. Phys.: Condens. Matter 21, 382203 (2009).[4] J. H. Dai et al., Proc. Natl. Acad. Sci. 106, 4118 (2009).[5] Y. K. Li et al., Physica C (Proceedings of M2S-IX, to be published)[6] Y. K. Luo et al., arXiv: 0907.2961 (2009).
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Strong Momentum-Dependent Doping-Induced Renormalizations of Optical Phonons in single Crystals of SmFeAs(O1−xFy)
Desmond McMorrow
London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London, WC1H 0AJ, UKE-mail: [email protected]: www.london-nano.com/content/lcndirectory/mcmorrow/
We report inelastic x-ray scattering experiments on the lattice dynamics in SmFeAsO and superconducting SmFeAsO0.6F0.35 single crystals. Particular attention was paid to the dispersions along the [100] direction of three optical modes close to 23 meV, polarized out of the FeAs planes. Remarkably, two of these modes are strongly renormalized upon fluorine doping. These results provide significant insight into the energy and momentum dependence of the coupling of the lattice to the electron system and underline the importance of spin-phonon coupling in the superconducting iron-pnictides.
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Neutron scattering study on structure, magnetic order and excitations in the Fe-based superconductors
Wei Bao
Department of Physics, Renmin University of China, Beijing 100872, China
We will present our neutron scattering works on the 1111, 122 and 11-types of the Fe-based superconductor materials. There appears to be a preference for the superconducting state in the tetragonal structure and the antiferromagnetic state in the distorted orthorhombic or monoclinic structure [1-4]. However, we reported the first coexistence of the two states in the orthorhombic phase of the 122 system [5], which differs from the generic phase diagram of the cuprate superconductors but similar to that for many heavy fermion superconductors.
The in-plane antiferromagnetic order of both the 1111 and 122 systems [2-3] has been prevalently explained by the nesting Fermi surface spin-density-wave picture. However, such type of theories face serious challenge with our observed antiferromagnetic order in the 11 system [4]. We were the first to correctly determine the magnetic moment orientation and the propagating vector in relation to the structural distortion[2,3], which help screening correct theoretic works. The rare earth magnetic ions also alter the interlayer magnetic correlation[2]. The first order nature of the phase transition in the 122 and 11 system[3-6] has been accepted by most researchers in the field, and one should realize that a failure to observe the supercooled water does not mean the freezing transition is not a first-ordered one.
We demonstrated beyond doubt the existence of a two-dimensional spin resonance excitation mode in the 11 type superconductor [7]. Interestingly, the resonance energy appears to be temperature independent, while only its intensity shows an order-parameter-like behavior. The ARPES spectrum of the superconducting gap seems to show a similar behavior. Although phonons are unlikely to mediate the high Tc of these materials [1], the close relation between the resonance and the superconductivity does not automatically point to a magnetic mechanism [7]. New results in high magnetic field and at higher energies will be presented to determine the nature of the system, if time allows.
References:
[1] Y. Qiu et al., Neutron scattering study of the oxypnictide superconductor LaO0.87F0.13FeAs, Phys. Rev. B 78, 052508 (2008).
[2] Y. Qiu et al., Crystal structure and antiferromagnetic order in NdFeAsO1−xFx (x = 0 and 0.2) superconducting compounds, Phys. Rev. Lett. 101, 257002 (2008).
[3] Q. Huang et al., Neutron-diffraction measurements of magnetic order and a structural transition in the parent BaFe2As2 compound, Phys. Rev. Lett. 101, 257003 (2008).
[4] W. Bao et al., Tunable (δ, δ)-Type Antiferromagnetic Order in Fe(Te,Se) Superconductors, Phys. Rev. Lett. 102, 247001 (2009).
[5] H. Chen et al., Coexistence of the spin-density-wave and superconductivity in the Ba1−xKxFe2As2, Europhys. Lett. 85, 17006 (2008).
[6] M. Kofu et al., Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2, New Journal of Physics 11, 055001 (2009).
[7] Y. Qiu et al., Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe0.4Te0.6, Phys. Rev. Lett. 103, 067008 (2009).
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Recent ARPES results of several iron-based systems
Donglai Feng
Department of Physics, Fudan University
In this talk, I will cover our several recent “random” pieces of angle resolved photoemission spectroscopy results on FeTexSe1-x, BaNi2As2, BaFe2-xCoxAs2, and Ba1-xKxFe2As2 etc. The topics including the orbital nature of the band structure of various systems, superconducting gap symmetry, and effects of first order structure transition on the electronic structure.
Electronic Evidence of Unusual Magnetic Ordering in a Parent Compound
of FeAs-Based Superconductors
Xingjiang Zhou*
National Lab for Superconductivity,Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
High resolution angle-resolved photoemission measurements have been carried out on BaFe2As2, a parent compound of the FeAs-based superconductors. In the magnetic ordering state, there is no gap opening observed on the Fermi surface. Instead, dramatic band structure reorganization occurs across the magnetic transition. The appearance of the singular Fermi spots near (π,π) is the most prominent signature of magnetic ordering. These observations provide direct evidence that the magnetic ordering state of BaFe2As2 is distinct from the conventional spin-density-wave state. They reflect the electronic complexity in this multiple-orbital system and necessity in involving the local magnetic moment in describing the underlying electron structure.
[1]. L. Zhao et al., Chin. Phys. Lett. 25(2008) 4402. [2]. H. Y. Liu et al., Phys. Rev. B 78(2008), 184514.[3]. Guodong Liu et al., arXiv:0904.0677.
*In collaboration with Guodong Liu, Haiyun Liu, Lin Zhao, Wentao Zhang, Xiaowen Jia, Jianqiao Meng, Xiaoli Dong, Jun Zhang, G. F. Chen, Guiling Wang, Yong Zhou, Yong Zhu, Xiaoyang Wang, Zuyan Xu and Chuangtian Chen
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Interplay of 4f magnetism and superconductivity in EuFe2As2
M. Nicklas
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
The recent discovery of high temperature superconductivity in iron-arsenides, RFeOAs (R=La to Gd) and AFe2As2 (A=Ca, Sr, Eu, Ba), has attracted tremendous interest in these materials. The undoped compounds show a tetragonal-to-orthorhombic structural phase transition associated with magnetic ordering giving rise to a spin-density-wave (SDW) instability between 150 and 200 K, which can be suppressed by chemical substitution or external pressure. In the AFe2As2 the SDW and the structural transition take place at the same temperature, T0, showing their intimate relation. Our pressure studies on SrFe2As2 show that the magnetic and structural transition stay closely linked under pressure. We can estimate a critical pressure of 4-5 GPa for the suppression of T0 to zero temperature in SrFe2As2.1
In contrast to the SrFe2As2, where only the iron possesses a magnetic moment, in EuFe2As2 an additional large, local magnetic moment carried by Eu2+. Like SrFe2As2, EuFe2As2 exhibits an SDW transition around T0 = 190 K related to the Fe2As2 layers but in addition, the magnetic moments of the localized Eu2+ order at TN = 20 K. Above 2 GPa we find a sharp drop of the resistivity, ρ(T), indicating the onset of SC at Tc ≈ 29.5 K. Remarkably, on further reducing the temperature, ρ(T) is increasing again and exhibiting a maximum caused by the ordering of the Eu2+ moments, behavior which is reminiscent of re-entrant SC as it is observed, for example, in the ternary Chevrel phases or in the rare-earth nickel borocarbides. This observation evidences the detrimental effect of the Eu2+ moments on superconductivity in EuFe2As2.
[1] M. Kumar, M. Nicklas, A. Jesche, N. Caroca-Canales, M. Schmitt, M. Hanfland, D. Kasinathan, U. Schwarz, H. Rosner, and C. Geibel, Phys. Rev. B 78,184516 (2008).
[2] C. F. Miclea, M. Nicklas, H. S. Jeevan, D. Kasinathan, Z. Hossain, H. Rosner, P. Gegenwart, C. Geibel, and F. Steglich, Phys. Rev. B (accepted).
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Magnetism and correlations in pnictides and fullerines.
Elihu Abrahams
Serin Physics Laboratory ,Rutgers University , 136 Frelinghusen Rd. , Piscataway, NJ 08854-8019 ; http://www.physics.rutgers.edu/~abrahams/
A strong-correlation analysis of the antiferromagnetic behavior in the undoped iron pnictides will be reviewed and a comparison will be made to the recently observed antiferromagnetic phase in Ce-doped C60 buckyballs.
Second Renormalization of Tensor-Network States
Tao Xiang
Institute of Physics and Institute of Theoretical Physics, Chinese Academy of Sciences
In this talk, I will give an introduction to a second renormalization group method which is proposed to handle the tensor-network states or models. This method reduces dramatically the truncation error of the tensor renormalization group. It allows physical quantities of classical tensor-network models or tensor-network ground states of quantum systems to be accurately and efficiently determined.
Towards a global phase diagram of the magnetic heavy fermions
Qimiao Si
Rice University
I will summarize work done with Seiji Yamamoto on the Kondo effect in the presence of magnetic order, for Kondo lattice systems in dimensions higher than one [1]. Implications [2,3] of these results for the magnetic quantum phase transitions and the global phase diagram of heavy fermion systems will be considered. Some directions for future studies will be discussed.
[1] S. J. Yamamoto and Q. Si, Phys. Rev. Lett. 99, 016401 (2007); Physica B 403, 1414 (2008); arXiv:0812.0819; arXiv:0906.0014. See also T. T. Ong and B. A. Jones, Phys. Rev. Lett. 103, 066405 (2009).
[2] Q. Si, Physica B 378, 23 (2006); S. J. Yamamoto and Q. Si, to be published (2009).
[3] P. Coleman, to be published (2009).
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Universal linear-temperature dependence of static magnetic susceptibility in iron-pnictides
Guang-Ming Zhang
Dept. of Physics, Tsinghua University, Beijing 100084, China
A universal linear-temperature dependence of the uniform magnetic susceptibility has been observed in the nonmagnetic normal state of iron-pnictides. This non-Pauli and non-Curie-Weiss-like paramagnetic behavior cannot be understood within a simple mean-field picture. We argue that it results from the existence of a wide fluctuation window in which the local spin-density-wave correlation exists but the global directional order has not yet been established. Our theory provides an indirect evidence that short range magnetic correlation could be correlated with the superconducting pairing.
Reference
G. M. Zhang, Y. H. Su, Z. Y. Lu, Z. Y. Weng, D. H. Lee, and T. Xiang, Eruophysics Letters 86, 37006 (2009).
Atomic and electronic structures of ternary iron arsenides AFe2As2 (001) surfaces (A=Ba, Sr, or Ca)
Zhong-Yi Lu
Department of Physics, Renmin University, Beijing, China
By the first-principles electronic structure calculations, we find that energetically the most favorable cleaved AFe2As2 (001) surface (A=Ba, Sr, or Ca) is A-terminated with R45° or (1×2) order. The (1×2) ordered structure yields a (1×2) dimerized STM image as the experiment observed. The A atoms are found to diffuse on the surface with a small energy barrier so that the cleaving process may destroy the A atoms ordering. At the very low temperatures this may result in an As-terminated surface with the A atoms in randomly assembling. The As-terminated BaFe2As2 surface in orthorhombic phase is buckled with R45° order, giving rise to a switchable R45° STM pattern upon an applied bias. No any reconstruction is found for the other As-terminated surfaces. There are surface states nearby the Fermi energy found in the As-terminated and (1×2) A-terminated surfaces. A unified physical picture is thus established to help understand the cleaved AFe2As2(001) surfaces.
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Applications of LDA+Gutzwiller Method for Correlated Electron Systems
Zhong Fang
Institute of Physic, Chinese Academy of Science, Beijing 100190, China
We will introduce our newly developed ab initio LDA+Gutzwiller method, in which the Gutzwiller variational approach is naturally incorporated with the density functional theory (DFT) through the “Gutzwiller density functional theory (GDFT)” (which is a generalization of original Kohn-Sham formalism). This method can be used for ground state determination of electron systems ranging from weakly correlated metal to strongly correlated insulators with long-range ordering. We will show that its quality for ground state is as high as that by dynamic mean field theory (DMFT), and yet it is computationally much cheaper. In addition, the method is fully variational, the charge-density self-consistency can be naturally achieved, and the quantities, such as total energy, linear response, can be accurately obtained similar to LDA-type calculations. Applications on several typical systems will be presented, and the characteristic aspects of this new method will be demonstrated. References: [1] X. Y. Deng, X. Dai, Z. Fang, EPL 83, 37008 (2008).[2] G. T. Wang, X. Dai, Z. Fang, PRL 101, 066403 (2008).[3] X. Y. Deng, L. Wang, X. Dai, Z. Fang, PRB 79, 075114 (2009).
Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface
Xi Dai
Institute of Physics, Chinese Academy of Sciences
Topological insulators are new states of quantum matter in which surface states residing in the bulk insulating gap of such systems are protected by time-reversal symmetry. The study of such states was originally inspired by the robustness to scattering of conducting edge states in quantum Hall systems. Recently, such analogies have resulted in the discovery of topologically protected states in two-dimensional and three-dimensional band insulators with large spin–orbit coupling. So far, the only known three-dimensional topological insulator is BixSb1-x, which is an alloy with complex surface states. Here, we present the results of first-principles electronic structure calculations of the layered, stoichiometric crystals Sb2Te3, Sb2Se3,Bi2Te3 and Bi2Se3. Our calculations predict that Sb2Te3, Bi2Te3 and Bi2Se3 are topological insulators, whereas Sb2Se3 is not. These topological insulators have robust and simple surface states consisting of a single Dirac cone at the 0 point. In addition, we predict that Bi2Se3 has a topologically non-trivial energy gap of 0.3 eV, which is larger than the energy scale of room temperature. We further present a simple and unified continuum model that captures the salient topological features of this class of materials.
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Exact results on the minimal conductivity of graphene at zero gate-voltage
Xiaoqun Wang
Department of Physics, Renmin University of China, Beijing, China I will present some exact results on the minimal conductivity of grapheme at zero gate-voltage and show the asymmetry nature of the conductivity with respect to the gate-voltage. The results are given for the graphene is connected to the ordinary leads, relevant to experimental settlements and different from those obtained theoretically for the leads being graphene.
Electron spin resonance in Kondo systems
Peter Wö lfle
Institut für Theorie der Kondensierten Materie, Universität Karlsruhe
Well-defined electron spin resonance (ESR) lines have been detected recently in several heavy fermion compounds, in which ferromagnetic correlations appear to be present[1]. We first discuss [2] the theory of ESR for the Kondo impurity system at temperatures T<<TK (Kondo temperature) , where the local spin ESR line has a width of order TK and is therefore unobservably broad. By contrast, in the Anderson lattice system in the Kondo regime the lattice coherence causes the ESR linewidth to be narrow, broadened only by spin lattice relaxation and quasiparticle interaction processes. The total ESR linewidth is reduced by exchange narrowing induced by a ferromagnetic exchange interaction. In the Fermi liquid regime the observed linewidth is well accounted for by theory. In the non-Fermi liquid regime the temperature dependence of resonance shift and linewidth can be related to the static spin susceptibility and the specific heat. The pronounced anisotropy observed can be largely traced back to the single ion anisotropy.
[1] C. Krellner et al., Phys. Rev. Lett. 100, 066401 (2008)[2] E. Abrahams and P. Woelfle, Phys. Rev. B78, 104423 (2008)
Email: [email protected]
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Spin-roton excitations and Tc formula for the cuprate superconductors
Z. Y. Weng
Institute for Advanced Study, Tsinghua University
We identify a new kind of elementary excitations in the superconducting state of a doped Mott insulator, called spin-rotons. They will play a central role in deciding the superconducting transition temperature, resulting in a simple Tc formula: Tc=Eg/γkB with γ≈6 and Eg as the characteristic energy scale of the spin-rotons. We show that the singlet (S=0) and triplet (S=1) rotons are degenerate in energy, hinting the spin-charge separation, which can be probed by A1g Raman scattering and neutron scattering, respectively, and are in excellent agreement with the high-Tc cuprates.
Signatures of symmetry and relative sign of the pairing gaps in a multiband superconductor in tunnelling
Qiang-Hua Wang
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing Unversity, Nanjing 210093, China
We demonstrate that tunnelling into multi-band iron-arsenide superconductors through a wide junction in the transparent limit can provide unambiguous signatures for the symmetry and relative sign ν of the pairing gaps on the Γ and M Fermi pockets. For anti-phase s-wave pairing, Andreev reflections can be thoroughly suppressed by inter-band destructive interference. This also occurs for tunnelling along the anti-nodal (nodal) direction of anti-phase (in-phase) d-wave gaps with distinctive line-shapes in the spectra as compared to the s-wave case. If ν is reversed, Andreev reflections survive but are subject to inter-band de-coherence due to quasi-particles.
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Probing non-Abelian anyons in the quantum Hall interferometry
Xin Wan
Asia-Pacific Center for Theoretical Physics, Pohang, Korea and Department of Physics, Zhejiang University, Hangzhou, China
The fractional quantum Hall state at Landau level filling fraction 5/2 has attracted considerable attention recently due to its possible non-Abelian quasiparticle excitations, which can be used to implement fault-tolerant quantum computation. The exotic ground state is widely believed to be the Moore-Read state (or its particle-hole conjugate), a reincarnation of a chiral p-wave superconductor with charge-e/4 non-Abelian quasiparticle excitations being neutral Majorana fermions dressed by charged chiral bosons. Such a non-Abelian quasiparticle, in particular its non-Abelian statistics, can be probed by an odd-even effect in a double point contact interferometer. However, the system also supports Abelian charge-e/2 quasiparticles, which are also relevant to inter-edge tunneling. I will discuss the contrasting behavior of the two kinds of quasiparticles in inter-edge tunneling and in thermal smearing, which leads to nontrivial signatures in quasiparticle interferometry observed in a very recent experiment (Willett et al., PNAS, 2009). In particular, the alternating e/4 and e/2 oscillation at low temperatures is speculated to be related to the existence of non-Abelian quasiparticles. The competing interpretation based on the Coulomb blockade effect will be discussed.
Dephasing and disorder effects in quantum spin Hall effect
X.C. Xie
Oklahoma State University and Institute of Physics, Chinese Academy of Sciences
The influence of dephasing on the quantum spin Hall effect (QSHE) is studied. In the absence of dephasing, the longitudinal resistance in a QSHE system exhibits the quantum plateaus. We find that these quantum plateaus are robust against the normal dephasing but fragile with the spin dephasing. Thus, these quantum plateaus only survive in mesoscopic samples. Moreover, the longitudinal resistance increases linearly with the sample length but is insensitive to the sample width. These characters are in excellent agreement with the recent experimental results [Science 318, 766 (2007)]. In addition, we define a new spin Hall resistance that also exhibits quantum plateaus. In particular, these plateaus are robust against any type of dephasing and therefore, survive in macroscopic samples and better reflect the topological nature of QSHE.
In addition, we also study the disorder effect on the transport properties in QSHE. We confirm that at a moderate disorder strength, the initially un-quantized two terminal conductance becomes quantized, and the system makes a transition to the novel topological Anderson insulator (TAI). Conductances calculated for the stripe and cylinder samples reveal the topological feature of TAI and supports the idea that the helical edge states may cause the anomalous quantized plateaus. The influence of disorder is studied by calculating the distributions of local currents. Base on the above-mentioned picture, the phenomena induced by disorder in the quantum spin Hall region and TAI region are directly explained.
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Quantum Spin Hall Effect in InAs/GaAs Quantum Well
Rui-Rui Du
Rice University
The quantum Hall effect refers to the quantization of charge Hall resistance (in units of h/e2, where h is the Planck constant and e is the electronic charge), observed in a quantum well when an intense magnetic field is applied at low temperatures. The Quantum Spin Hall Effect (QSHE) is an emergent phenomenon recently discovered in semiconductors and other novel materials, where the intrinsic spin Hall conductance is quantized in the absence of any magnetic field. This talk will report on the experimental efforts in Rice University in low temperature quantum transport and Terahertz spectroscopy studies in InAs/GaAs quantum wells, in which an inverted band structure can be engineered and fine-tuning by electrostatic gates. We describe experimental results showing energy gap and edge transport in this system. The prospects for observing QSHE in this material and profound correlated properties, as predicted by recent theories, will be discussed.
Quantum Phase Transition in Hall Conductivity on an Anisotropic Kagome Lattice
Shun-Li Yu, Jian-Xin Li,* and Li Sheng
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
We study theoretically the quantum Hall effect(QHE) on the Kagom\'{e} lattice with anisotropy in one of the hopping integrals. We find a new type of QHE characterized by the quantization rules for Hall conductivity σxy=2ne2/h and Landau Levels E(n)=±vF
\sqrt{(n+1/2)\h (n is an integer), which is different from known types. This phase evolves from the QHE phase with σxy=4(n+1/2)e2/h and E(n) = ±vF i v v in the isotropic case, which is realized in a system with massless Dirac fermions (such as in graphene). The phase transition does not occur simultaneously in all Hall plateaus but in sequence from low to high energies, with the increase of hopping anisotropy.
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Optical Cavity-Induced Bistability in Spinor Bose-Einstein Condensate
Han Pu
Dept. of Physics and Astronomy, Rice University , Houston, TX 77251-1892 , USA
Quantum gases confined inside an optical cavity represents an ideal system to study the interplay between light waves and matter waves. I will discuss a system composed of a spinor atomic condensate inside a ring optical cavity. The cavity field shifts the atomic levels, whereas atoms act as a nonlinear medium which modifies the dynamics of the cavity field. Through such mutual influence, we demonstrate a novel nonlinear phenomenon: Both light and matter waves exhibit strong bistability, and such strong bistability can be achieved at a mean photon number less than unity.
Non-Abelian Josephson effect and half vortex of cold atoms in traps and microcavities
Wu-Ming Liu（刘伍明）
Institute of Physics, Chinese Academy of Sciences, Beijing 100080(e-mail: [email protected])
We investigate the non-Abelian Josephson effect in F=2 spinor Bose-Einstein condensates with double optical traps. We propose a real physical system which contains non-Abelian Josephson effect and has very different density and spin tunneling characters compared with the Abelian case. We calculate the frequencies of the pseudo Goldstone modes in different phases between two traps respectively, which are the crucial feature of the non-Abelian Josephson effect. We also give an experimental protocol to observe this novel effect in future experiments [1]. We also study Josephson effect for photons in two weakly linked microcavities [2], and quantum magnetic dynamics of polarized light in arrays of microcavities [3]. We investigate dynamic creation of fractionalized half-quantum vortices in Bose-Einstein condensates of sodium atoms. Our simulations show that both individual half-quantum vortices and vortex lattices can be created in rotating optical traps when additional pulsed magnetic trapping potentials are applied. We also find that a distinct periodically modulated spin-density-wave spatial structure is always embedded in square half-quantum vortex lattices. This structure can be conveniently probed by taking absorption images of ballistically expanding cold atoms in a Stern-Gerlach field [4]. We also investigate localization and the Kosterlitz-Thouless transition of fermion with disorder in hexagon lattices [5].
References: [1] R. Qi, X. L. Yu, Z. B. Li, W. M. Liu, Phys. Rev. Lett. 102, 185301 (2009).[2] A. C. Ji, Q. Sun, X. C. Xie, W. M. Liu, Phys. Rev. Lett. 102, 023602 (2009).[3] A. C. Ji, X. C. Xie, W. M. Liu, Phys. Rev. Lett. 99, 183602 (2007).[4] A. C. Ji, W. M. Liu, J. L. Song, F. Zhou, Phys. Rev. Lett. 101, 010402 (2008).[5] Y. Y. Zhang, J. P. Hu, B. A. Bernevig, X. R. Wang, X. C. Xie, W. M. Liu, Phys. Rev. Lett. 102, 106401 (2009).
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Radio frequency spectroscopy in atomic Fermi gases
Qijin Chen
Zhejiang Institute of Modern Physics & Department of Physics, Zhejiang University, Hangzou, China
Atomic Fermi gases are a rapidly evolving new interdisciplinary field between condensed matter and AMO physics. Using a Feshbach resonance, the pairing interaction strength can be tuned continuously from weak to strong, effecting a BCS--BEC crossover. Unlike an electron system in typical condensed matter physics, experimental probes for atomic Fermi gases are very limited. Radio frequency (RF) spectroscopy is one the few very important experimental techniques. It probes directly the fermionic excitation gap. In this talk, I will introduce experimental progress in this regard and present a theory which addresses various issues related to both momentum integrated and momentum resolved RF spectroscopy measurements in trapped atomic Fermi gases. In this context, we conclude that the previously observed double-peak structure are indeed associated with paired atoms in the trap center and unpaired atoms in the trap edge, respectively. In addition, momentum resolved RF spectroscopy is equivalent to the powerful angle-resolved photoemission spectroscopy (ARPES) in an electron system.
References:
1. Q.J. Chen and K. Levin, Phys. Rev. Lett. 102, 190402 (2009).
2. Y. He, C.C. Chien, Q.J. Chen and K. Levin, Phys. Rev. Lett.102, 020402 (2009).
3. Y. He, C.C. Chien, Q.J. Chen and K. Levin, Phys. Rev. A 77, 011602(R) (2008).
4. Y. He, Q.J. Chen, and K. Levin, Phys. Rev. A 72, 011602(R) (2005).
5. Q.J. Chen, J. Stajic, S.N. Tan, and K. Levin, Physics Reports 412, 1-88 (2005) .
Low-energy dynamics in single-walled carbon nanotubes
J. Kono
Department of Electrical and Computer Engineering, Rice University
Many-body physics in one-dimensional (1-D) systems is one of the most challenging and interesting subjects in condensed matter physics today. Metallic single-walled carbon nanotubes (SWNTs) are one of the cleanest 1-D electron systems available for basic studies, and there have been some pioneering DC transport studies probing interaction effects. However, finite-frequency and non-equilibrium dynamics of interacting degenerate 1-D electrons are predicted to be even more exotic. We are exploring GHz and THz dynamics of spin and charge in carbon nanotubes to advance our understanding of this problem. We have observed strongly anisotropic THz conductivities in highly-aligned SWNT films, from which we have determined the complex dynamic conductivity tensor elements as a function of frequency. We are further extending this work to study dynamic conductivities over a wider frequency range as a function of temperature and magnetic field and search for correlation signatures. In addition, we use GHz electron spin resonance (ESR) in SWNTs to search for the predicted signatures of spin-charge separation. We have observed ESR in annealed SWNTs, demonstrating the Dysonian lineshape characteristic of conduction ESR. I will discuss the implications of the observed temperature dependence of the ESR lineshape in terms of quasi-1D hopping and disorder effects.
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Luttinger-Liquid Physics and Bose-Einstein Condensation in Quantum Magnets
Christian Rüegg
London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
The phase diagram of quasi-1D arrays of quantum spins in temperature and magnetic field is particularly rich: quantum disordered, quantum critical, spin Luttinger-liquid, BEC, and classically saturated phases can in principle be studied [1-3]. However, model materials are rare, where these phases can be explored experimentally - with the exception of the novel metal-organic compound (C5H12N)2CuBr4, a quasi-1D two-leg spin ladder. We determined the complete phase diagram of this material [2,3], and measured by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field across the two intrinsic quantum critical points [4]. Discrete magnon modes at low fields in the quantum disordered phase and at high fields in the saturated phase contrast sharply with a spinon continuum at intermediate fields characteristic of the Luttinger-liquid phase. By tuning the magnetic field, we drive the fractionalization of magnons into spinons and, in this deconfined regime, observe both commensurate and incommensurate continua [4].
[1] T. Giamarchi, Ch. Rüegg, O. Tchernyshyov, Nature Physics 4, 198 (2008).[2] Ch. Rüegg et al., Phys. Rev. Lett. 101, 247202 (2008).[3] B. Thielemann et al., Phys. Rev. B 79, 020408(R) (2009).[4] B. Thielemann et al., Phys. Rev. Lett. 102, 107204 (2009).
Electronic correlations in single-molecule and other nanojunctions
D. Natelson, G. D. Scott, Z. K. Keane, J. M. Tour
Dept. of Physics and Astronomy, Rice University
In recent years techniques have been developed to produce nanoscale junctions for use in studying the physics of electronic conduction at the atomic and molecular scale. Single-molecule transistors (SMTs) are of particular interest. In SMTs conduction between source and drain electrodes takes place via tunneling through a channel consisting ideally of an individual small molecule; a gate electrode capacitively coupled to that molecule allows the controlled tuning of the molecular electronic states relative to the chemical potentials of the source and drain. Using SMTs containing molecules with unpaired electronic spins, we and others have been able to study Kondo physics, the formation of a low temperature correlated electronic state comprising a local spin coupled to conduction electrons. I will discuss recent results concerning the universality of the scaling of the Kondo resonance, comparing Kondo physics in 29 SMTs from two different molecule types with that reported in a GaAs quantum dot with Kondo energy scales nearly three orders of magnitude smaller. We find intriguing consistency within the SMT data, and systematic quantitative differences with the GaAs scaling data. I will also discuss recent surprising results that we obtain in nominally bare Pd tunnel junctions, indicating the possible presence of a novel phase at low temperatures.
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Mixed coherent and incoherent dynamics in strongly correlated quantum systems
A.J. Fisher1
UCL Department of Physics and AstronomyandLondon Centre for Nanotechnology,University College London, Gower Street, London WC1E 6BT, [email protected]
In studying the dynamics of strongly correlated quantum systems one frequently wants to pick out a coherent quantum part against an incoherent background, and to study the response to a driving field that may be coherent (for example, a magnetic field) or incoherent (for example a temperature gradient) in nature. In this talk I will discuss how the standard theory of linear response must be modified to deal with cases where a system is perturbed by a change to the relaxation processes it undergoes, as well as by a change to the Hamiltonian, and I will give three examples where this type of mixed coherent-incoherent process is important: the theory of time dependent electron spin resonance, the low-frequency spin dynamics of rare earth ions [1], and the recently proposed generation of spin entanglement by interaction with a common thermal bath [2].
References
[1] Quantum Projection in an Ising Spin Liquid. D.M. Silevitch, C.M.S. Gannarelli, A.J. Fisher, G. Aeppli, and T.F. Rosenbaum. Phys. Rev. Lett. 99 057203 (2007)
[2] Long-lived spin entanglement induced by a spatially correlated thermal bath. D. P. S. McCutcheon, A. Nazir, S. Bose and A. J. Fisher, Phys. Rev. A 80, 022337 (2009).
1Work performed with C.M.S. Gannarelli, D.P. McCutcheon, S. Bose, A. Nazir and W. Wu
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Superconductivity in the Heavy-Fermion Systems CeCoIn5 and CeRhIn5
J. D. Thompson*
Los Alamos National Laboratory
The heavy-fermion materials CeCoIn5 and CeRhIn5 are revealing the richness of quantum states allowed by strong electronic correlations. One manifestation is the unusual normal state out of which their unconventional superconductivity develops. Another is recent evidence for a direct coupling between long-range magnetic order and superconductivity, for example, in CeRhIn5 under pressure and in Cd-doped CeCoIn5. The discovery that superconductivity is necessary for coexisting, field-induced magnetic order pure CeCoIn5 is even more surprising. This quantum state appears to be distinct from any prior experiences, including what is found in the high-Tc cuprates or in CeRhIn5. Understanding the relationship of these orders to each other and to the normal state poses a challenge to both experiment and theory.
* In collaboration with A. Bianchi, Z. Fisk, M. Kenzelmann, R. Movshovich, M. Nicklas, T. Park, O. Stockert, and V. A. Sidorov
Kondo-Cluster-Glass State near a Ferromagnetic Quantum Phase Transition in CePd1−xRhx
M. Brando
Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
CePd1−xRhx is one of the few ferromagnetic heavy-fermion systems where the ferromagnetism can be traced from 6.6 K in CePd down to 25 mK for x = 0.87. Non-Fermi liquid (NFL) behavior has been observed at concentrations close to 0.87 suggesting the presence of a quantum critical point (QCP). I will present a comprehensive study of CePd1−xRhx ((0.6 ≤ x ≤ 0.95)) poly- and single crystals by means of low-temperature ac susceptibility, magnetization and volume thermal expansion. Despite pronounced NFL effects in both, specific heat and thermal expansion, the Grüneisen ratio does not diverge as T → 0, providing evidence for the absence of a QCP. Instead, the low temperature magnetic properties indicate frozen clusters rather than long-range order for x ≥ 0.65. This is ascribed to the formation of a peculiar Kondo-cluster-glass state and the NFL effects in the specific heat, ac susceptibility and magnetization are compatible with thequantum Griffiths phase scenario.
In collaboration with: T. Westerkamp, M. Deppe, R. Küchler, C. Geibel, P. Gegenwart, A. P. Pikul, F. Steglich, J. G. Sereni and T. Vojta.
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Superconductivity in heavy fermion compounds and iron pnictides (chalcogenides): a study under extreme conditions
Huiqiu Yuan
Department of Physics, Zhejiang University
In this talk, I will discuss (1) superconductivity and quantum criticality in the heavy fermion compounds and (2) the anisotropy of upper critical field in the newly discovered iron-based superconductors. In the first part, I will show you the evidence of two superconducting states observed in some Ce-based heavy fermion compounds under high pressure and discuss their order parameter symmetry and possible pairing mechanism[1-4]. In the second part, the unique behavior of nearly isotropic upper critical field found in the layered superconductors of Ba-122 and Fe1.11Te0.6Se0.4 will be presented[5].
In collaboration with M. Grosche, M. Deppe, C.Geibel, F. Steglich, J. D. Thompson, T. Park, E. Bauer, M. B. Salamon, J. Singleton, F. F. Balakirev, S. Baily, G. F. Chen, J. L. Luo, N. L. Wang, M. H. Fang, Z. Q. Mao.
References：[1] H. Q. Yuan, F. M. Grosche, M. Deppe, C. Geibel, G. Sparn and F. Steglich, Science 302, 2104
(2003).[2] H. Q. Yuan, F. M. Grosche, M. Deppe, C. Geibel, G. Sparn, F. Steglich, Phys. Rev. Lett. 96, 047008
(2006).[3] S. Kawasaki, M. Yashima, Y. Mugino,H. Mukuda,Y. Kitaoka, H. Shishido, Y. Onuki, Phys. Rev.
Lett. 96, 147001 (2006).[4] D. Vandervelde, H. Q. Yuan, Y. Onuki, M. B. Salamon, Phys. Rev. B 79, 212505 (2009).[5] H. Q. Yuan, J. Singleton, F. F. Balakirev, S. Baily, G. F. Chen, J. L. Luo, N. L. Wang, Nature 457,
565 (2009).
Berry phase effects in quantum critical Kondo breakdown scenarios
Stefan Kirchner
Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, D-01187 Dresden, Germany
The Berry phase has embodied quantum mechanics ever since Berry's seminal work in the early 1980s showing that the adiabatic evolution of a quantum system is characterized by a geometrical phase, the Berry phase, on top of the dynamical phase. It has found fruitful applications in various areas of physics ranging from atomic physics to quantum field theory. This talk addresses the role, the Berry phase can have in a quantum critical system. We address the sub-Ohmic Bose-Fermi Kondo model (BFKM) in terms of a coherent-state spin-path-integral representation which brings out explicitly a Berry phase term in the action. We demonstrate that, in the fully spin-isotropic case, the Kondo-destroying fixed point is an interacting one because of the existence of the Berry phase term and is therefore beyond a description in terms of order parameter fluctuations alone. Our results suggest that the quantum critical local properties of the sub-Ohmic BFKM are those of an underlying boundary conformal field theory. For a related model, the quantum critical pseudogap Kondo model, corresponding results have been obtained with a (continuous-time) Quantum Monte Carlo method.
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Pairing symmetry of Sr2RuO4 probed by tunneling and phase-sensitive measurements
Ying Liu
Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA.
I will present a brief overview of the current status of the Sr2RuO4 research, focusing in particular on results from quasi-particle tunneling and phase-sensitive measurements. Scanning tunneling microscope (STM) and planar tunnel junction based quasi-particle tunneling measurements, which can provide the gap value and other spectroscopy information of a superconductor important for understanding the mechanism of superconductivity, have so far yielded very different gap values, most likely due to the variation in sample preparation. Our planar tunnel junction measurements appear to indicate that Sr2RuO4 is a weak coupling superconductor with a gap value consistent with the BCS expectation. I will discuss phase-sensitive measurements aimed at determining the orientation variation of the phase of the superconducting order parameter, which was shown in the high-Tc research to be among the most powerful tools for determining the pairing symmetry of an unconventional, non-s-wave superconductor. I will present our results of the first phase-sensitive measurement on Sr2RuO4, showing compelling evidence that Sr2RuO4 is a spin-triplet, chiral p-wave superconductor, and comment on outstanding issues on pairing symmetry and other aspects of Sr2RuO4.
Spinons and covalency effects in the one-dimensional spin-½ cuprate antiferromagnets Sr2CuO3 and SrCuO2
Toby Perring1,2, Andrew Walters2,3†, Igor Zaliznyak3, Jean-Sebastien Caux4, Andrei Savici3, Genda Gu3, Chi-Cheng Lee3, Wei Ku3
1 ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK2 Department of Physics and Astronomy, University College London, Gower Street, LondonWC1E 6BT, UK3 London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AJ, UK4 CMP&MS Department, Brookhaven National Laboratory, Upton, New York 11973, USA5 Institute for Theoretical Physics, University of Amsterdam, 1018 XE Amsterdam, Netherlands
We report a comprehensive study of the spin fluctuations in the one-dimensional spin ½ antiferromagnetic cuprates Sr2CuO3 and SrCuO2, in which the bandwidth of the two-spinon continuum is ~0.75 eV, a significant fraction of the charge gap of ~1.4 eV. We used inelastic neutron scattering to map the spinon dynamics up to 0.6 eV and quantitatively compared the data to the exact dynamical structure factor for the one-dimensional spin ½ Heisenberg Hamiltonian, including both the two-spinon and four-spinon contributions which account for 98% of the total spectral weight. Although the experimental dynamical structure factor is well described by the model, the magnetic intensity is modified dramatically by strong hybridisation of Cu 3d states with the oxygen p states. Ab initio LDA+U calculations reveal significant spin density on the oxygen sites; the resulting covalent magnetic form factor enables a full quantitative explanation for the measured dynamical structure factor.
† Present address: ESRF, 6 rue Jules Horowitz, 38000 Grenoble, France
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Entropy landscape of phase formation in the vicinity of quantum criticality in Sr3Ru2O7
Andreas Rost
School of Physics and Astronomy, University of St Andrews
In recent years the itinerant metamagnet Sr3Ru2O7 has been studied intensely both experimentally and theoretically. It is believed to be close to a quantum critical point in whose vicinity a new phase with 'electron nematic'-like transport properties is formed. Here we present a systematic magnetocaloric and specific heat study of this material. First we will discuss thermodynamic evidence for the nature of the phase transitions enclosing the anomalous phase region as well as the highly unusual properties of the phase itself. Second, we will present the results of a detailed study of the surrounding low and high field 'normal' states. In particular experimental data indicating a magnetic field dependent renormalisation of the Fermi liquid properties upon approaching the critical field will be discussed.
Specific-Heat Measurement of Residual Superconductivity in the Normal State of Underdoped Cuprate Superconductors
Hai-Hu Wen, Gang Mu, Huiqian Luo, Huan Yang, Lei Shan, Cong Ren, Peng Cheng, Jing Yan, Lei Fang
National Laborotary for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences,
P. O. Box 603, Beijing 100080, P. R. China
We have measured the magnetic field and temperature dependence of specific heat on Bi2Sr2−xLaxCuO6+δ single crystals in wide doping and temperature regions. The superconductivity related specific heat coefficient γsc and entropy Ssc are determined. It is found that γsc has a hump-like anomaly at Tc and behaves as a long tail which persists far into the normal state for the underdoped samples, but for the heavily overdoped samples the anomaly ends sharply just near Tc. Interestingly, we found that the entropy associated with superconductivity is roughly conserved when and only the long tail part in the normal state is taken into account for the underdoped samples, indicating the residual superconductivity above Tc. Our results strongly indicate that the superconducting transition in underdoped cuprate superconductors is not BCS-like.
H. H. Wen et al., Phys. Rev. Lett.103, 067002 (2009).
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Magnetism and Pairing Symmetry in the Iron-based Superconductors
Jiangping Hu
Department of Physics, Purdue University, West Lafayette, IN 47906,USAEmail: [email protected]
We discuss the existence of strikingly identical paradigms applicable to both cuprates and iron-based superconductors in understanding magnetism, superconductivity and the interplay between the two. The magnetic states and transitions in iron- based superconductors are well described by a J1-J2-Jz magnetic exchange model where J1, J2 and Jz are nearest neighbour, next nearest neighbour and inter-layer couplings respectively. Differing from the t-J model for cuprates where d-wave pairing symmetry is favored, the magnetic exchange in the iron based superconductors leads to a new prediction that an unconventional s-wave coskxcosky pairing dominates. We emphasize that the superconducting gaps in different Fermi pockets are determined by a single energy scale parameter which is a distinctive prediction that differs from the weak coupling theories. We will show recent experimental results that support the model and it’s predictions
References:
[1] Chen Fang, Hong Yao, Wei-Feng Tsai, JiangPing Hu, and Steven A. Kivelson, Phys. Rev. B, 77, 224509 (2008)
[2] Kangjun Seo, A. B. Bernevig and JiangPing Hu, Phys. Rev. Lett, 101, 206404 (2008) [3] Meera M. Parish, Jiangping Hu and B. Andrei Bernevig, Phys. Rev. B, 78, 144514 (2008) [4] Kangjun Seo, Chen Fang, B. Andrei Bernevig,and Jiangping Hu, Phys. Rev. B 79, 235207 (2009). [5] Wei-Feng Tsai, Dao-Xin Yao, B. Andrei Bernevig, and JiangPing Hu, Phys. Rev. B 80,012511
(2009) [6] Wei-Feng Tsai, Yan-Yang Zhang, Chen Fang and Jiangping Hu, Phys. Rev. B, 80, 064513 (2009)
arXiv: 0905.0734. [7] Yan-Yang Zhang, Chen Fang, Xiaoting Zhou, Kangjun Seo, Wei-Feng Tsai, B. Andrei
Bernevig,and Jiangping Hu, Phys. Rev. B, in press, arXiv:0903.1694. [8] Ronny Thomale, Christian Platt, Jiangping Hu, Carsten Honerkamp, B. Andrei Bernevig, arXiv:
0906.4475
Spin Density Wave effects and unusual temperature dependence of magneto-transport in Chromium
Yeong-Ah Soh
Imperial College
Chromium forms a spin density wave (SDW) antiferromagnet below its Neel temperature (TN). Signatures of this spin ordering are seen in the resistivity and Hall coefficient. In this talk, I will present magneto-resistance measurements in a Cr film, which show the formation of the SDW, and unusual temperature dependences. Three key observations will be presented – a) an anomalous negative magnetoresistance cusp at TN, b) violation of Kohler’s rule both above and below TN, c) and an unusual temperature dependence of the Hall angle, Hall coefficient above TN, Hall and magneto-conductivities, which point to the existence of two different scattering lifetimes associated with electric and magnetic fields.
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Multi-component BECs
You-Quan Li
Zhejiang Institute of Modern Physics and Department of Physics,Zhejiang University, Hangzhou 310027, China
We give a brief description of theoretical studies on multi-component BEC in one dimension and some discussions on systems with atom-to-molecule conversion. We use Bethe-ansatz method to expose that the ground state of the one dimensional bosons with pseudo-spin is fully polarized and there is a quadratic spin wave mode. The conversion of two species of atoms into stable molecules through the Feshbach resonance assisted by stimulated Raman adiabatic passage in photoassociation is studied with the help of mean-field Langrange density. The conversion efficiency is large for the fully bosonic system as well as the boson-fermion mixture as long as the general two-photon resonance condition is satisfied. A proper magnetic field pulse sequence is shown to enhance molecular conversion efficiency.
[1] YQ Li, SJ Gu, ZJ Ying, and U Eckern, Exact results of the ground state and excitation properties of a two-component interacting Bose system, Europhys. Lett. 61, 268 (2003) arXiv:cond-mat/0107578
[2] ZX Hu, QL Zhang, and YQ Li, Ground state properties of one-dimensional Bose-Fermi mixtures, J. Phys. A: Math. Gen. 39, 351 (2006).
[3] LH Lu and YQ Li, The effects of optically induced non-Abelian gauge field in cold atoms, Phys. Rev. A 76, 023410 (2007).
[4] LH Lu and YQ Li, Conversion of 40K-87Rb mixtures into stable molecules, Phys. Rev. A 76, 053608 (2007).
[5] LH Lu and YQ Li, Atom-to-molecule conversion efficiency and adiabatic fidelity，Phys. Rev. A 77, 053611 (2008).
[6] XQ Xu, LH Lu and YQ Li, Phase separation in atom-molecule mixtures near a Feshbach resonance, Phys. Rev. A 79, 043604 (2009).
[7] XQ Xu, LH Lu, and YQ Li, Enhancing molecular conversion efficiency by a magnetic field pulse sequence, Phys. Rev. A (2009) to appear.
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Considerations on the Transition Temperatures of Electronically induced Superconductivity
Chandra Varma
Department of Physics & Astronomy, University of California , Riverside
I will review the considerations for transition temperature of electronically induced superconductivity with emphasis on the effect of self-energy and pari-breaking due to inelastic scattering. The connection of superconductivity to quantum-critical points in Cuprates, Heavy fermions and Pnictides will be illustrated. It will be shown that Gaussian class of quantum criticality is bad for high Tc but the class of topological quantum-criticality is ideal. Finally, prospects for room temperature superconductivity will be discussed.
Magnetic properties of helical metal
Fu-Chun Zhang
Department of Physics, and Center of Theoretical and Computational Physics,The University of Hong Kong, Hong Kong, China
The magnetic properties of a helical metal will be discussed.
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List of Participants
Invited Speakers, Organizers and Committee Members:
Elihu AbrahamsDepartment of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019 USAE-Mail:[email protected] URL: http://www.physics.rutgers.edu/~abrahams/
Gabriel AeppliDepartment of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United KingdomE-Mail: [email protected] URL: http://www.cmmp.ucl.ac.uk/people/aeppli.html
Manuel BrandoMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, GermanyE-Mail: [email protected] URL: http://www.cpfs.mpg.de/web/forschung/forschbere/festkoerpphys/brando/
Guanghan Cao (曹光旱)Department of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, CHINAEmail: [email protected]
Qijin Chen (陈启谨)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, CHINAEmail: [email protected] URL: http://zimp.zju.edu.cn/~qchen/
Xian-Hui Chen (陈仙辉)Department of Physics, University of Science and Technology of China, 96 Jinzai Road, Hefei, Anhui 230026, ChinaEmail: [email protected]
Piers ColemanDepartment of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USAE-Mail: [email protected] URL: http://www.physics.rutgers.edu/~coleman/
Jianhui Dai (戴建辉)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, CHINAEmail: [email protected]
Xi Dai (戴希)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected] URL: http://theory.iphy.ac.cn/English/cv/xidai/xidai.htm
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Rui-Rui Du (杜瑞瑞)Department of Physics and Astronomy -- MS 61, Rice University, 6100 Main Street, Houston, Texas 77005, USA E-Mail:[email protected] URL: http://www.ruf.rice.edu/~dulab/index.html
Minghu Fang (方明虎)Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, CHINAEmail: [email protected]
Dong-Lai Feng (封东来)Department of Physics, Fudan University, 220 Handan Road, Shanghai 200433, ChinaEmail: [email protected] URL: http://www.physics.fudan.edu.cn/tps/people/dlfeng
Zhong Fang (方忠)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected]
Andrew J FisherLondon Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United KingdomE-Mail: [email protected] URL: http://www.cmmp.ucl.ac.uk/~ajf/
Changde Gong (龚昌德)Department of Physics, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu 210093, China Email: [email protected]
Jiangping Hu (胡江平)Department of Physics, College of Science, Purdue University525 Northwestern Avenue, West Lafayette, IN 47907-2036Email: [email protected] URL: http://www.physics.purdue.edu/people/faculty/hu.shtml
Stefan KirchnerMax Planck Institute for Physics of Complex Systems, Noethnitzer Strae 38, D-01187, Dresden, GermanyE-Mail: [email protected] URL: http://www.mpipks-dresden.mpg.de/~kirchner/index.html
Junichiro KonoDepartment of Electrical and Computer Engineering -- MS 366, Rice University, 6100 Main Street, Houston, Texas 77005, USAE-Mail:[email protected] URL: http://www.ece.rice.edu/~kono/
Jian-Xin Li (李建新)Department of Physics, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu 210093, China Email: [email protected]
You-Quan Li (李有泉)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, CHINAEmail:[email protected] URL: http://zimp.zju.edu.cn/~tcmp/english/yq-hpage.htm
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Wu-Min Liu (刘伍明)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected] URL: http://theory.iphy.ac.cn/English/cv/wmliu/wmliu.HTM
Ying Liu (刘荧)Department of Physics, The Pennsylvania State University 104 Davey Lab, University Park, PA 16802, USAE-Mail: [email protected] URL: http://www.phys.psu.edu/~liu/
Hilbert v. LoehneysenPhysikalisches Institut, Universität Karlsruhe (TH), D-76128 Karlsruhe, GermanyE-Mail: [email protected] , [email protected] URL: http://www.pi.uni-karlsruhe.de/loehneys/loehneys.html
Zhong-Yi Lu (卢仲毅)Department of Physics, Renmin University of China, 59 Zhongguancun Street, Haidian District, Beijing 100872, ChinaEmail: [email protected]
Zhi-Qiang Mao (毛志强)Physics Department, Tulane University, New Orleans, Louisiana 70118, USAE-Mail: [email protected] URL: http://www.physics.tulane.edu/Faculty/MaoInfo.shtml
Desmond F McMorrowLondon Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United KingdomE-Mail: [email protected] URL: http://www.london-nano.com/content/lcndirectory/mcmorrow/
Douglas NatelsonDepartment of Physics and Astronomy -- MS 61, Rice University, 6100 Main Street, Houston, Texas 77005, USA E-Mail: [email protected] URL: http://www.ruf.rice.edu/~natelson/
Michael Nicklas Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, GermanyE-Mail: [email protected]
Toby PerringISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, United KingdomEmail: [email protected] URL: http://www.isis.stfc.ac.uk/People/toby_perring5822.html
Han Pu (浦晗)Department of Physics and Astronomy -- MS 61, Rice University, 6100 Main Street, Houston, Texas 77005, USA Email:[email protected] URL: http://cohesion.rice.edu/naturalsciences/physics/FacultyDetail.cfm?RiceID=1263
Andreas RostScottish Universities Physics Alliance (SUPA), School of Physics and Astronomy,University of St Andrews, North Haugh, St Andrews KY16 9SS, United KingdomEmail: [email protected] URL: http://www.st-andrews.ac.uk/physics/condmat/mackenzie/GroupMembers/AndreasRost/index.html
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Christian RueggLondon Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United KingdomE-Mail: [email protected] URL: http://www.london-nano.com/content/contactlcn/lcndirectory/christianruegg/
Qimiao Si (斯其苗)Department of Physics and Astronomy -- MS 61, Rice University, 6100 Main Street, Houston, Texas 77005, USAE-Mail:[email protected] URL: http://cohesion.rice.edu/naturalsciences/physics/FacultyDetail.cfm?RiceID=705
Yeong-Ah SohUniversity College London,UKDepartment of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755, USAE-Mail:[email protected] URL: http://www.dartmouth.edu/~physics/faculty/soh.html
Frank SteglichMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, GermanyE-Mail: [email protected] URL: http://www.cpfs.mpg.de/departments/physics/steglich-seite_en.html
Oliver StockertMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, GermanyE-Mail: [email protected] Joe D. ThompsonCondensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAE-Mail: [email protected]
Chandra Varma Department of Physics and Astronomy, University of California, Riverside, California 92521, USA Email: [email protected] URL: http://www.physics.ucr.edu/faculty_staff/faculty_pages/varma.html
Xin Wan (万歆)Asia-Pacific Center for Theoretical Physics and Department of Physics, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784, KoreaEmail: [email protected] URL: http://sites.google.com/site/xinwan90/Home orZhejiang Institute of Modern Physics and Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: [email protected] URL: http://zimp.zju.edu.cn/~xinwan/
Qiang-Hua Wang (王强华)Department of Physics, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu 210093, China Email: [email protected]
Xiao-Qun Wang (王孝群)Department of Physics, Renmin University of China, 59 Zhongguancun Street, Haidian District, Beijing 100872, ChinaEmail: [email protected] URL: http://sphysics.ruc.edu.cn/en/100746/20057.html
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Hai-Hu Wen (闻海虎)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected] URL: http://ssc.iphy.ac.cn/nlsc/english/people/hhwen.htm
Zheng-Yu Weng (翁征宇)Center for Advanced Study, Tsinghua University, HaiDian District, Beijing 100084, ChinaEmail: [email protected]
Steffen WirthMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, GermanyE-Mail: [email protected] URL: http://www.cpfs.mpg.de/~wirth/
Peter WoelfleInstitut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, GermanyE-Mail: [email protected] URL: http://www.tkm.uni-karlsruhe.de/personal/woelfle/
Tao Xiang (向涛)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected]
Xin-Cheng Xie (谢心澄)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected] URL: http://theory.iphy.ac.cn/English/cv/xcxie/xcxie.htm
Zhu'an Xu (许祝安)Department of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: [email protected]
Heping Ying (应和平)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: [email protected]
Lu Yu (于渌)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected]
Huiqiu Yuan (袁辉球)Department of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: [email protected]
Fu-Chun Zhang (张富春)Department of Physics, Hong Kong University, Pokfulam Road, Hong Kong, orDepartment of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: [email protected]
Guang-Ming Zhang (张广铭)Department of Physics, Tsinghua University, HaiDian District, Beijing 100084, ChinaEmail: [email protected] URL: http://www.phys.tsinghua.edu.cn:8080/english/personnel/profile.php?lang=en&id=38
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Yuheng Zhang (张裕恒) Department of Physics, University of Science and Technology of China, 96 Jinzai Road, Hefei, Anhui 230026, ChinaEmail: [email protected]
Hang Zheng (郑 杭) Department of Physics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, ChinaEmail: [email protected]
Xing-Jiang Zhou (周兴江)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: [email protected]
Yi Zhou (周毅)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, CHINAEmail: [email protected]
Special Guests from Rice University
Carol Quillen Vice Provost for Academic Affairs, Rice UniversityEmail: [email protected]
Mark DavisAssistant to the President, Rice UniversityEmail: [email protected]
Other Participants
Bin Chen (陈斌) Email: [email protected] Dept. of Physics, University of Shanghai for Science and Technology
Qinghu Chen (陈庆虎) Email: [email protected]. of Physics, Zhejiang Normal University, 688 Yingbin Blvd, Jinhua, Zhejiang 321004, China
Yongjin Jiang (蒋永进) Email: [email protected] Dept. of Physics, Zhejiang Normal University, 688 Yingbin Blvd, Jinhua, Zhejiang 321004, China
Jingshuang (金锦双) Email: [email protected] Department of Physics, Hangzhou Normal University
Baoxing Li (李宝兴) Email: [email protected] Department of Physics, Hangzhou Normal University
Jianmin Li (李健民) Email: [email protected] of Physics, Zhejiang University, 38 Zheda Rd., Hangzhou, Zhejiang 310027, China
Sheng Li (李盛) Email: [email protected] Dept. of Physics, Zhejiang Normal University, 688 Yingbin Blvd, Jinhua, Zhejiang 321004, China
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Kang Li (李康) Email: [email protected] Department of Physics, Hangzhou Normal University
Hong Mao (毛鸿) Email: [email protected] of Physics, Hangzhou Normal University
Bruce Normand Email: [email protected]
Yuehua Su Email: [email protected] Yan-Tai University
Ming-Qiu Tan (谭明秋) Email: [email protected] Department of Physics, Zhejiang University, 38 Zheda Rd., Hangzhou, Zhejiang 310027, China
Xiaofeng Xu (许晓峰) Email: [email protected] of Physics, Hangzhou Normal University
Jiansong Yang (杨建宋) Email: [email protected] Department of Physics, Hangzhou Normal University
Jiefang Zhang (张解放) Email: [email protected] Dept. of Physics, Zhejiang Normal University, 688 Yingbin Blvd, Jinhua, Zhejiang 321004, China
Jian-Xin Zhong (钟建新)Center for Condensed Matter Physics, Faculty of Material and Photoelectronic Physics, Xiangtan University, Xiangtan 411105, Hunan, ChinaEmail: [email protected] URL: http://www.xtu.edu.cn/daoshi/index.php?id=585
Secretaries
Institution Name Email
Department of Physics,Zhejiang University
Qian Tao [email protected] Shan [email protected] Ke [email protected]
Student Participants
Institution Name Email
Pennsylvania State University Yiqun Alex Ying [email protected]
Rice University Lei Jiang [email protected]
Institute of Physics, Chinese Academy of Sciences
Lei Wang [email protected]
Hua Jiang [email protected]
Fudan University
Lexian Yang [email protected]
Cheng He [email protected]
Fei Chen [email protected]
Yan Zhang [email protected]
Nanjing UniversitySunli Yu [email protected]
Da Wang [email protected]
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Center for Advanced Study, Tsinghua University
Jiawei Mei [email protected]
Zhejiang Normal University
Zhidong Yao [email protected]
Jihong Hu [email protected]
Jingjing Wang [email protected]
Lingjun Zhu [email protected]
Yuanping Xu [email protected]
Liangliang Wang [email protected]
Cun Qian [email protected]
Xiaoli Lu [email protected]
Weifeng Jiang [email protected]
Yuan Yang [email protected]
Hangzhou Normal University Liu, Zizhong (刘子重) [email protected]
Zhejiang University
Cai, Jian-Qiu (蔡建秋) [email protected]
Chen, Hong-Bo [email protected]
Chen, Hua (陈华) [email protected]
Chen, Jian (陈健) [email protected]
Dong, Chiheng (董持衡) [email protected]
Guo, Hanjie (郭汉杰) [email protected]
Guo, Lukai (郭鲁开) [email protected]
Jiang, Shuai (蒋帅) [email protected]
Jiao, Lin (焦琳) [email protected]
Li, Yuke (李玉科) [email protected]
Li, Zujuan (李祖娟) [email protected]
Lin, Xiao (林效) [email protected]
Liu, Chang-Ming (刘长明) [email protected]
Luo, Hai-Jun (罗海军) [email protected]
Luo, Yongkang (罗永康) [email protected]
Lu, Li-Hua (吕丽花) [email protected]
Ning, Hua (宁华) [email protected] m
Shang, Tian (商恬) [email protected]
Tao, Qian (陶前) [email protected]
Tong, Jun (童君) [email protected]
Wang, Hangdong (王杭栋) [email protected]
Wang, Jibiao (王继标) [email protected]
Wang, Mang-Mang (王芒芒) [email protected]
Xing, Hui (邢晖) [email protected]
Xu, Dong-Hui [email protected]
Xu, Xiao-Qiang [email protected]
Yang, Lin (杨琳) [email protected]
Yang, Tingting (杨婷婷) [email protected]
Ye, Xiangzhi (叶翔志) [email protected]
Zeng, Xianlin (曾宪林) [email protected]
Zhang, Jinglei (张警蕾) [email protected]
Zhang, Yun-Li (张云丽) [email protected]
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Attendee Guide
Transportation
Shuttle Bus Info
Oct-12Zhejiang Hotel → Zhejiang University 08:15 Lily Hotel → Zhejiang University 08:25
Zhejiang University → Both Hotels 20:00
Oct -13Lily Hotel → Zhejiang Hotel 08:05
Zhejiang Hotel → Songcheng Park 19:15 Songcheng Park → Both Hotels 21:30
Oct -14Lily Hotel → Zhejiang Hotel 08:05
Zhejiang Hotel → West Lake 14:00 West Lake → Both Hotels 21:00
Oct -15Lily Hotel → Zhejiang Hotel 08:05
Zhejiang Hotel → Lily Hotel 19:30
Trips (flight, hotel, cars etc.) information (English): http://english.ctrip.com/Bus information (Chinese): http://hot.dahangzhou.com/top/hzgj/index.htmTrain information (Chinese): http://hot.dahangzhou.com/top/hzhc/index.htm
Local Tours
Two local trips will be organized for all registered Conference Participants free-of -charge. The details of the tours are as follows: Tour A –The Romance of the Song Dynasty (indoor and panorama style large-scale performance) Date: 13 Oct. 2009 (Tue) 7:20pm - 9:00pmTour B – Visit the West Lake Date: 14 Oct. 2009 (Wed) 2:00pm - 5:00pmFor more Hangzhou travel information, see the website (English):http://www.chinatravel.net/china-destinations/Hangzhou/cityintroduction-5.html
Tips
1. In view of the recent outbreak of the Human Swine Influenza (Influenza A H1N1), it is of paramount importance for everyone to be vigilant in practicing good hygiene measures to prevent acquiring and spreading infections. If you are under the weather, see a doctor right away.
2. During 4:00pm to 6:00pm, it’s very hard to find a taxi, because of drivers’ handover.3. Currency exchange: The currency unit in China is Renminbi (RMB/CNY). It is pegged to the US
dollars at a rate of CNY6.83 to US$1, with little fluctuation. Most banks provide currency exchange services. For less than 100 USD, you can exchange at Zhejiang Hotel.
4. Emergency Numbers: Emergency Line (24 hours): 110 Ambulance Service (24 hours): 120
Maps
You can find a Hangzhou map (English version) in your document bag.
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Conference contact info
Jianhui Dai (Prof.) Mobile: 13819101236 email: [email protected] Yuan (Prof.) Mobile: 15925666127 email: [email protected] Xu (Prof.) Mobile: 13588186778 email: [email protected]
Hotel contact info:
Zhejiang Hotel (浙江宾馆) Tel: +86-571-87180808 Address. : 278 Santaishan Road, Hangzhou (杭州三台山路 278 号).Website: http://www.zhejianghotel.com/en/
Hangzhou Lily Hotel (百合花饭店): Tel: +86-571-87991188 Address. : 156 Shuguang Road, Hangzhou (杭州曙光路 156 号).Website: http://www.lilyhotel.com
Map of the Yuquan Campus, Zhejiang University
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Floor Map of Zhejiang Hotel
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Location of Lily Hotel
Local Map
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Yuquan Campus Map
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Notes
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