2017–2018A N N UA L R E P O R T

MISSION

AT A GLANCE

22 4 2 FACULTY MEMBERS

ACADEMICDEPARTMENTS

WORKSHOPS

Rice University’s Center for Quantum

Materials seeks to sustain and grow

fundamental research of quantum

materials on campus, and develop an

international network in this area, with Rice

at its hub. The center will incubate new

research collaborations and directions by

organizing scientific workshops, supporting

distinguished visitors to Rice, sponsoring

postdoctoral scholars and student

researchers and developing international and

domestic partnerships.

WORKSHOPS

25 7 28 INTERNATIONAL

VISITORSNETWORKING OPPORTUNITIES FOR FACULTY AND GRADUATE STUDENTS

INVITED TALKS

“Rice is well-positioned to lead in this area. First, the university has an intimacy that makes cross-disciplinary research the norm rather than the exception. Collaboration comes naturally here. We are small enough that almost everyone on campus can be on a first-name basis, and we have always used that to our advantage.”“But in the area of quantum materials, we also have numbers. We woke up one day and said, ‘Wow. We’re big.’ That’s unusual for Rice, and it presents us with an opportunity to capitalize on our broad expertise in this field and on our unique collaborative culture.”

Qimiao SiRCQM Director

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RCQM ADVISORY BOARD

Elihu Abrahams

UCLA (not pictured)

RCQM has drawn on experts from across the country and around the world to serve on the advisory board.

Frank Steglich Max Planck Institute for Chemical Physics

of Solids, Dresden

Hongjie DaiStanford

University

Laura GreeneUniversity

of Illinois at Champaign-

Urbana

Meigan Aronson

Texas A&M University

Allan H. MacDonald University of Texas at

Austin

Jason Ho Ohio State University

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RCQM MEMBERSHIP

*Executive Committee Members

Palash BharadwajKevin KellyJun Kono *Gururak Naik

Pengcheng Dai *Rui-Rui DuMatt Foster Emilia Morosan

Pulickel AjayanJun LouEmily RingeBoris Yakobson *

Peter RosskyGus ScuseriaJames Tour

Kaden Hazard Randy Hulet *Tom KillianHan Pu

CONDENSED MATTER

Doug NatelsonAndriy NevidomskyyQimiao Si * Director

MATERIALS SCIENCE AND NANOENGINEERING

CHEMISTRY

ATOMIC, MOLECULAR AND OPTICAL ENGINEERING

ELECTRICAL AND COMPUTER ENGINEERING

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ABOUT RCQM

Pictured at the center’s formal launch on December 15 are (from left) Ned Thomas, dean of the George R. Brown School of Engineering; Yousif Shamoo, Vice Provost for Research; Peter Rossky, dean of the Wiess School of Natural Sciences; Qimiao Si, director of the Center for Quantum Materials; Pulickel Ajayan, the Benjamin M. and Mary Greenwood Anderson Professor in Materials Science and NanoEngineering and of chemistry; and Tom Killian, department chair and professor of physics and astronomy.

Mission Statement

Rice University’s Center for Quantum Materials seeks to sustain and grow fundamental research of quantum materials on campus, and develop an international network in this area, with Rice at its hub. The center will incubate new research collaborations and directions by organizing scientific workshops, supporting distinguished visitors to Rice, sponsoring postdoctoral scholars and student researchers and developing international and domestic partnerships.

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VISITING SCHOLARS & INVITED SPEAKERS

Daniel Agterberg / (U Wisc Milwaukee) Fiona Burnell / (University of Minnesota) Hong Ding / (IOP, Beijing) Lukasz Fidkowski / (University of Washington)Pouyan Ghaemi / (CUNY)Andreas Ludwig / (UCSB) Vidya Madhavan / (UIUC) Masaki Oshikawa / (University of Tokyo) Johnpierre Paglione / (U Maryland)Silke Paschen / (TU Wien) Masatoshi Sato / (Kyoto University)Hai-Hu Wen / (Nanjing University)Jimmy Williams / (University of Maryland, College Park)Shingo Yonezawa / (Kyoto University)

Prof. Jae-ho Chung, is a professor of physics at Korean University in Seoul, Korea. He obtained his Ph. D degree from Prof. Takeshi Egami at U. Penn. and is an expert in pdf studies of correlated electron materials and phonons. Prof. Chung arrive in the Spring of 2018 and plans to spend one year at Rice to increase our visibility in this area of research. Prof. Chung and RCQM Executive Committee Member Pengcheng Dai have had several opportunities to discuss possible future collaborations using his expertise in phonons and pdf measurements. His expertise also matches well with the synthesis work of Emilia Morosan and theory work of Qimiao Si and Andriy Nevidomskyy. His one year at Rice will greatly increase the potentially for future collaborations between Rice and Korea University. Prof. Chung has made a number of interesting contributions to our understanding of the electron-lattice interaction in strongly correlated materials.

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TOPOLOGICAL SUPERCONDUCTORS: MATERIALS, TOPOLOGICAL ORDER, AND QUENCHED DISORDER

In the past decade there has been an explosion of interest in new forms of topological matter, driven by the discoveries of topological insulators and gapless topological phases. An intense effort is now being made to employ these as platforms for topological superconductivity. The discovery of bulk 3D topological superconductors would carry the promise of exotic quantum phenomena on their surface, in the form of so-called Majorana surface states. Several candidate materials have been proposed and are currently being measured and hotly debated.

The discovery of bulk topological superconducting materials could open the door to topological quantum computation, in which quantum information is stored in the topology of a macroscopic quantum state. Much experimental and theoretical effort has been invested by major companies to realize topological quantum computing in artificial (engineered) systems, but many technical barriers remain to be solved. Bulk topological superconductors could solve these problems “automatically” through a physical realization of the needed topology, if a suitable host material is found. The time is ripe for a small, intensive conference hosting both experimentalists and theorists to discuss prospects for bulk topological superconductivity. The conference will emphasize materials and existing experiments, as well as fundamental theoretical advances that link topological superconductors to the well-known quantum Hall effect in 2D. The workshop will address these key unsolved problems and by bringing together experts from different communities, will help advance the research frontier.

April 24-25, 2018

Invited Speakers

TheoristsAndreas Ludwig (UCSB) Daniel Agterberg (U Wisc Milwaukee) Lukasz Fidkowski (University of Washington) Masaki Oshikawa (University of Tokyo) Masatoshi Sato (Kyoto University)Pouyan Ghaemi (CUNY)Fiona Burnell (University of Minnesota)

ExperimentalistsJohnpierre Paglione (U Maryland, co-organizer)Hai-Hu Wen (Nanjing University)Vidya Madhavan (UIUC) Hong Ding (IOP, Beijing) Shingo Yonezawa (Kyoto University) Jimmy Williams (University of Maryland, College Park)Silke Paschen (TU Wien)

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ASPEN WINTER CONFERENCE “HIGH TEMPERATURE SUPERCONDUCTIVITY – UNIFYING THEMES IN DIVERSE MATERIALS”

Iron-based superconductivity has been at the center of condensed matter physics for nearly a decade. Recent developments in the study of the iron chalcogenides have renewed hope of reaching even higher transition temperature for superconductivity. Meanwhile, considerable progress has been made on the understanding of their microscopic physics. Over the same period, the study of the venerable copper-based superconductors has undergone a drastic resurgence, due to a flurry of experimental discoveries and new theoretical understandings on the electronic orders in the pseudogap regime.

This Aspen Winter Conference highlighted the aforementioned developments, and showcased the unifying themes that are emerging from studying a diverse set of materials. While the focus was on the iron- and copper-based systems, the conference also featured the deepening understanding on quantum criticality in heavy fermion and organic superconductors, physics of spin liquids, as well as superconductivity above 200 K that has been reported under extreme pressure during the past two years.

The conference program contained nine sessions of invited talks, with ample time allocated for discussions, and two sessions of poster presentations.

January 14-20, 2018

Organizers

Robert J. Birgeneau (UC Berkeley)Zhi-Xun Shen (Stanford University)Qimiao Si (Rice University)

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NETWORKING EVENTS

In addition to seminars and

workshops, RCQM hosted a series

of fun, low-stress poster lunches as

way to foster collaboration between

research groups, refine presentation

skills and highlight some of the

center’s most recent results.

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INTERNATIONAL INITIATIVES

RCQM was proud to host a joint poster session with the Nakatani RIES Fellows from Japan. This event served as the capstone for their five-week research internship experience in a range of science & engineering laboratories at Rice.

RCQM also hosted the 2017 TOMODACHI-STEM at Rice University for Female Students poster session. The five-week research internship included 10 female undergraduates from Japan who are majoring in science & engineering (S&E). The program enabled students to gain real world experience with S&E research, provided an introduction to U.S. higher education and provided opportunities for cultural engagement and collaboration with U.S. students. The program was designed to serve as a catalyst for female Japanese students interested in S&E study and research and engagement with the U.S. through international research collaborations.

RCQM Director, Qimiao Si also traveled extensively building international relationship tp strengthen the RCQM brand abroad.

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DISTINGUISHED LECTURE SERIES

Dirac states protected by symmetry (against gap formation) occur in monolayer graphene and on the surfaces of topological insulators (e.g. Bi2Se3). In both cases, however, the Dirac states are strictly two-dimensional (or 2+1 D in spacetime). In 2012 the semimetals Na3Bi and Cd3As2 were predicted to be Dirac semimetals exhibiting protected 3+1D Dirac states in the bulk. Soon after the experimental veri-fication, Weyl states were discovered in the semimetals TaAs and NbAs. A phenom-enon long-predicted (1983) to occur in crystals with 3+1D Dirac states (but not in 2+1D) is the chiral anomaly. In relativistic field theory, all massless fermions separate into left- and right-handed chiral fermions that don’t mix. However, coupling the fermions to electromagnetic fields (parallel electric and magnetic fields in a crystal) destroys the chiral symmetry, resulting in the appearance of an axial current. This constitutes the chiral anomaly. I will describe the observation of the chiral anomaly in Na3Bi and the half Heusler metal GdPtBi. In this talk, I will attempt to provide an introductory description of these effects.

RCQM hosted its fouth Distinguished Lecture on November 29, 2017. We were proud to welcome N.P. Ong from Princeton University.

N. P. Ong, Princeton University

The chiral anomaly in Dirac and Weyl semimetals

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POSTDOCTORAL FELLOWSHIP IN QUANTUM MATERIALS

ALANNAH HALLASRice University

Introduction I joined the group of Emilia Morosan in the Department of Physics and Astronomy at Rice University as a Smalley Postdoctoral Fellow in Quantum Materials in September of 2017. The core of my research project is the design and synthesis of new quantum materials with exotic magnetic and electronic properties and their characterization. Since arriving at Rice, I have had the opportunity to learn many new technical skills, including: the flux crystal growth method and quartz work, electrical transport measurements, and heat capacity mea-surements. I have been able to use expertise gained during my PhD studies in the areas of neutron scattering and muon spin resonance to contribute to on-going projects in my group, which has led to three co-authored publications [1-3]. This report will summarize progress on three projects I am leading in the Morosan lab. I will conclude with a brief synopsis of my research plans for the coming year.

Project 1: Discovery of a chemically flexible family of dilute honeycomb magnets In the past year we have discovered a new family of materials with the chemical formula SrMxTe2-xO6, where M is a 3d transition metal, either Ni, Co, Mn, Fe, or Cr. In this hexagonal structure, shown in Figure 1, the M and Te cations are randomly distributed over a honeycomb network. This phase was initially serendipitously observed as an impurity phase. A systematic series of growth attempts were made over a period of months in order to isolate this phase and obtain phase pure samples. The crystal structure was solved by symmetry analysis of powder x-ray diffraction measurements. In these compounds the magnetism is carried solely by the M cation. Interestingly, this structure is versatile to the oxidation state of the transition metal; in the case of Ni and Co an M2+ oxidation state is observed whereas for Mn, Fe and Cr a M3+ oxidation state is found. As only 25% (M2+) or 33% (M3+) of the honeycomb lattice is occupied by the transition metal cation, we find that these systems are below the magnetic percolation threshold. I am currently in the process of studying their magnetic properties using SQUID magnetometry.

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Project 2: Complex magnetic and electronic properties of a cerium-based intermetal-lic The R3T4M13 (3-4-13) family of materials (where R is a transition metal, T is a transition metal and M is a Group 14 element) are hosts to many remarkable states, such as superconductivity, intermediate valence, and heavy fermion behavior. The Morosan lab has made numerous contributions in this family and have paid particular attention to the 3-4-13’s where the M site is occupied by germanium and the T site is occupied by iridium [3-6]. While this family is chemically stable for a wide-range of rare earth cations, one member of this family that has proven extremely difficult to synthesize is R = Ce. One of the earliest accom-plishments of my postdoctoral research was to optimize the growth of Ce3Ir4Ge13 using the self-flux method. Using the optimal recipe, we have been able to grow well-formed crystals that are approximately 1 mm3. We have discovered that the magnetic and electronic proper-ties of Ce3Ir4Ge13 are very complex and include: heavy fermion behavior, multiple magnetic transitions, a cross-over from itinerant to local behavior. We have studied these behaviors using magnetic susceptibility, heat capacity, and electrical resistivity in fields as large as 14 T and to temperatures as low as 50 mK. Recently we observed an apparent sample depen-dence in the low temperature physics for samples of Ce3Ir4Ge13 that are indistinguishable at the level of powder x-ray diffraction. To understand the origin of this sample dependence we have recently turned to single crystal x-ray diffraction measurements.

Project 3: One-dimensional magnetism in a copper-based system Dimensionality is a key determining factor in the ways magnetism manifests itself in materials. In the previous two projects, we saw examples of 2-dimensional and 3-dimension-al magnetism. The first system has a 2-dimensional honeycomb magnetic lattice, whereas the magnetism in the 3-4-13 family is fully 3-dimensional. The final system I am working on, SrCuTe2O7, has a quasi 1-dimensional zig-zag lattice made up of Cu2+ cations. I have prepared powder samples of SrCuTe2O7 using conventional solid-state synthesis. Now, I am working on growing single crystals of this material using a TeO2 flux method. Initial charac-terizations of this system confirm that the magnetism has a low-dimensional character, as evidenced by the distinctive broad hump in susceptibility near 100 K. This behavior is well captured by a model for 1D spin correlations. We also find that there is no evidence of long range magnetic order down to at least 2 K. I will expand upon these initial characterizations once I have succeeded in growing high quality single crystals.

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Directions for the coming year In the next year I will continue to push the above three projects towards completion in the form of peer-reviewed publications. I will also continue to work col-laboratively within my research group. For example, in the coming months I will per-form muon spin resonance measurements at TRIUMF national lab on several itinerant magnet systems being studied in the Morosan Lab. In July 2019 I will begin a tenure-track faculty position in the Department of Physics and Astronomy and the Stewart Blusson Quantum Matter Institute at the University of British Columbia in Vancouver, Canada where I will continue my research in the design, discovery and characteriza-tion of new quantum materials.

Figure 1: Crystal structure of the SrMxTe2-xO6 structure. Figure 3: Magnetic susceptibility of SrCuTe2O7 fit to a model for low-dimensional spin interactions and show-ing no long-range magnetic order down to 2 K.

Figure 2: Temperature and field dependence of the electrical resistivity of Ce3Ir4Ge13. A cross-over behavior is ob-served at high temperatures, 150 K. At lower temperature, a magnetic phase transition is observed at 2 K.

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[1] E. Svanidze, C. Georgen, A. M. Hallas, Q. Huang, J. M. Santiago, J. W. Lynn, and E. Morosan. “Band Jahn-Teller structural phase transition in Y2In.” Physical Review B 97, 054111 (2018).

[2] B. K. Rai, S. Chikara, Xiaxin Ding, Iain WH Oswald, R. Schoenemann, V. Loganathan, A. M. Hallas … and E. Morosan. “Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7.” arXiv preprint arXiv:1803.04013 (2018).

[3] B. K. Rai, Iain WH Oswald, Wenjing Ban, C-L. Huang, Vaideesh Loganathan, A. M. Hallas, M. N. Wilson … and E. Morosan. “Low-carrier density and fragile magnetism in a Kondo lattice system.” arXiv preprint arXiv:1805.01918 (2018).

[4] B. K. Rai, Iain WH Oswald, Jiakui K. Wang, Gregory T. McCandless, Julia Y. Chan, and E. Morosan. “Superconductivity in Single Crystals of Lu3T4Ge13–x (T = Co, Rh, Os) and Y3T4Ge13–x (T = Ir, Rh, Os).” Chemistry of Materials 27, 2488-2494 (2015).

[5] B. K. Rai, Iain WH Oswald, Julia Y. Chan, and E. Morosan. “Intermediate valence to heavy fermion through a quantum phase transition in Yb3(Rh1− xTx)4Ge13 (T = Co, Ir) single crystals.” Physical Review B 93, 035101 (2016).

[6] I. W. H. Oswald, Binod K. Rai, Gregory T. McCandless, Emilia Morosan, and Julia Y. Chan. “The proof is in the powder: revealing structural peculiarities in the Yb3Rh4Sn13 structure type.” CrystEngComm 19, 3381-3391 (2017).

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Quantum spin Hall effect (QSHE) is a fundamental and most spectacular phenom-enon arising from topological protection. To date the leading material systems are made of semiconductor quantum wells (QWs), i.e., HgTe/CdTe QW and inverted InAs/GaSb QWs. Although quantized edge conductance plateaus have been observed in mesoscopic size devices (edge length ~ 1-4 μm) for both systems, it is realized that regular InAs/GaSb host strongly interacting edge states due to an unusually small Fermi velocity ~ (2 – 4) × 104 ms-1 associated with the edge modes. On the other hand, the archetypical quantum spin Hall insulator made of HgTe material appears to have suffered drawbacks of disorders, and consequently to the best of our knowledge it has not demonstrated clear time reversal symmetry (TRS) protection. Overall, in order to fully understand the topological nature of the QSHE, it is much desirable to develop a plain vanilla quantum spin Hall insulator (QSHI) with properties dominated by single-particle physics.

Our recent works on strained-layer InAs/GaInSb QWs is a major step in establishing clear QSHE in real materials. This advance can be attributed to the large gaps attainable in strained-layer QWs, and the remarkable control in bilayer system. Here we list several excit-ing features observed in the strained InAs/GaInSb QSHI.

(1) The bulk hybridization gaps can be achieved to ~ 20 meV, enhancing by up to five folds as compared to the binary InAs/GaSb QSHI. (2) A large bulk gap leads to an increasing edge Fermi velocity, hence a decreas-ing interaction effect in the helical edge. Temperature and bias voltage dependence mea-surements of the edge conductance illustrate that the helical edge states of strained InAs/GaInSb is weakly interacting. (3) The edge conductance at zero and applied magnetic fields clearly manifests TRS-protected properties consistent with Z2 topological insulator. (4) The maximum coherence length of helical edge states in strained InAs/GaInSb QWs achieve ~ 11 μm, significantly longer than those in previous studies.

POSTDOCTORAL FELLOWSHIP IN QUANTUM MATERIAL

Tingxin LiRice University

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(5) The edge coherence length could be tuned by gates, demonstrating the edge conductance is correlated with the Fermi velocity vF, namely the interaction effects inside the helical edge states.

The potential impact of the present works would be that the strained-layer QWs have satisfied all essential requirements for the helical-edge/s-superconductor platform for building the scalable single-mode Majorana circuits, proving a competitive edge over any other approaches that so far proposed. Also our findings move one step closer to the device and circuit applications of QSHI based on semiconductor technology.

• RCQM led an EFRC proposal. PI: Qimiao Si; RCQM co-PIs: Pulickel M. Ajayan, Pengcheng Dai, Douglas Natelson, Silke Paschen, Junichiro Kono, and Emilia Morosan.

PROPOSALS 2017-18

COLLABORATIVE PROPOSALS

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PUBLICATIONS

Collaborative Publications

Tour-Ajayan-Lou collaboration:• “Three-Dimensional Printed Graphene Foams,” ACS Nano 2017, 11, 6860-6867. DOI: 10.1021/acsnano.7b01987

Tour-Yakobson collaboration:• “Atomic H-Induced Mo2C Hybrid as an Active and Stable Bifunctional Electrocatalyst,” ACS Nano 2017, 11, 384-394. DOI: 10.1021/acsnano.6b06089

Yakobson-Ajayan-Lou collaboration:

• “Self-Optimizing, Highly Surface-Active Layered Metal Dichalcogenide Catalysts for Hydrogen Evolution”, Nature Energy 2 (9), 17127 (2017).

Du-Kono collaboration:

• “Evidence for a Topological Excitonic Insulator in InAs/GaSb Bilayers,” Nature Communications 8, 1971 (2017).

Ajayan Group• “Exfoliation of a non-van der Waals material from iron ore hematite”, Nature Nanotechnology, DOI:10.1038/s41565-018-0134-y (2018).

• “Light-induced lattice expansion leads to high-efficiency perovskite solar cells”, Science, 360, 67-70 (2018).

• “Atomically Thin Gallium Layers from Solid-Melt Exfoliation”, Science Advances 4 (3), e1701373 (2018).

• “Fluorinated H-BN as a Magnetic Semiconductor”, Science Advances, 3(7): e1700842 (2017).

• ”Perovskite Physics Extremely Efficient Internal Exciton Dissociation through Edge States in Layered 2d Perovskites”, Science 355 (6331), 1288-1291 (2017).

• “A Materials Perspective on Li-Ion Batteries at Extreme Temperatures”, Nature Energy 2 (8), 17108 (2017).

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• “Two-Dimensional Non-Volatile Programmable P-N Junctions”, Nature Nanotechnology, 12, 901-905 (2017).

Pengcheng Dai group:• “Two-Dimensional Massless Dirac Fermions in Antiferromagnetic AFe2As2 (A=Ba,Sr)”, Phys. Rev. Lett. 119, 096401 (2017).

• “Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs”, Phys. Rev. X 8, 021056 (2018).

Rui Du Group• “Evidence for a topological excitonic insulator in InAs/GaSb bilayers”, Nature Communications, volume 8, Article number: 1971 (2017)

Matthew S. Foster Group:• ”Critical Percolation without Fine-Tuning on the Surface of a Topological Superconductor”, Phys. Rev. Lett. 121, 016802 (2018).

• “Dephasing Catastrophe in 4−ε Dimensions: A Possible Instability of the Ergodic (Many-Body-Delocalized) Phase’’, Phys. Rev. Lett. 120, 236601 (2018).

• “Quantum Multicriticality near the Dirac-Semimetal to Band-Insulator Critical Point in Two Dimensions: A Controlled Ascent from One Dimension”, Phys. Rev. X 8, 011049 (2018).

Thomas Killian group:• “Creation of Rydberg Polarons in a Bose Gas”, Phys. Rev. Lett. 120, 083401 (2018).

Jun Kono Group

• “Evidence for Dicke Cooperativity in Magnetic Interactions”, Science, accepted for publication.

• “Continuous Transition between Weak and Ultrastrong Coupling through Exceptional Points in Carbon Nanotube Microcavity Exciton–Polaritons”, Nature Photonics 12, 362 (2018).

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• “Vacuum Bloch-Siegert Shift in Landau Polaritons with Ultrahigh Cooperativity”, Nature Photonics 12, 324 (2018).

• “Scaling Law for Excitons in 2D Perovskite Quantum Wells”, Nature Communications 9, 2254 (2018).

• “Intersubband Plasmons in the Quantum Limit in Gated and Aligned Carbon Nanotubes”, Nature Communications 9, 1121 (2018).

• “Magnetooptics of Exciton Rydberg States in a Monolayer Semiconductor”, Physical Review Letters 120, 057405 (2018).

• “Tunable Room-Temperature Single-Photon Emission at Telecom Wavelengths from sp3 Defects in Carbon Nanotubes”, Nature Photonics 11, 577 (2017).

Han Pu Group• “Synthetic Landau Levels and Spinor Vortex Matter on a Haldane Spherical Surface with a Magnetic Monopole”, Phys. Rev. Lett. 120, 130402 (2018).

Emilie Ring Group• “Magnesium Nanoparticle Plasmonics,” Nano Letters (2018) 18, 3752-3758.• “Transition Metal Decorated Aluminum Nanocrystals,” ACS Nano//(2017), 11, 10281-10288

Peter Rossky group:• “Direct observation of backbone planarization via side-chain alignment in single bulky-substituted polythiophenes”, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA [Proc Natl Acad Sci USA] Volume: 115 Issue: 11 Pages: 2699-2704 (2018)

• “Fluorescent Proteins Detect Host Structural Rearrangements via Electrostatic Mechanism”, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY [J Am Chem Soc] Volume: 140 Issue: 4 Pages: 1203-1206 (2018)

Qimiao Si group:• “Weyl-Kondo Semimetal in Heavy Fermion Systems”, PNAS 115, 93 (2018).

• “Unconventional and conventional quantum criticalities in CeRh(0.58)Ir(0.42)In5”, Npj Quantum Materials 3, 6 (2018).

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”Evidence for fully gapped d-wave superconductivity in CeCu2Si2”, PNAS 115, 5343-5347 (2018).

• “Local orthorhombicity in the magnetic C4 phase of the hole-doped iron-arsenide superconductor Sr(1-x)Na(x)Fe2As2”, Phys. Rev. Lett. 119, 187001 (2017).

Jim Tour group:• “Molecular Machines Open Cell Membranes”, Nature 2017, 548, 567-572. DOI: 10.1038/nature23657

Boris Yakobson Group• “Intermixing and periodic self-assembly of borophene line defects”, Nature Mater., doi.org/10.1038/s41563-018-0134-1 (2018).

• “Transient kinetic selectivity in nanotubes growth on solid Co-W catalyst”, E.S. Penev, K.V. Bets, N. Gupta, and B.I. Yakobson, Nano Lett.,DOI: 10.1021/acs.nanolett.8b02283 ( 2018)

• “Evolutionary selection growth of two-dimensional materials on polycrystalline substrates”, Nature Mater., 17, 318-322, DOI: org/10.1038/s41563-018-0019-3 (2018). [News & Views: “Grown with the wind”, Nature Mater., 17 (4), 296-297, DOI: org/10.1038/s41563-018-0042-4 (2018)].

• “A library of atomically-thin metal chalcogenides”, Nature, 556, 355-359, DOI: 10.1038/s41586-018-0008-3 (2018).

• “Borophene as a prototype for synthetic 2D materials development”, Nature Nanotech., 13, 444-450, DOI: 0.1038/s41565-018-0157-4 (2018).

• “Two-dimensional boron polymorphs for visible range plasmonics - a first-principles exploration”, J. Am. Chem. Soc., 139, 17181-17185, DOI: 10.1021/jacs.7b10329 (2017).

• “Type-II multiferroic Hf2VC2F2 MXene monolayer with high transition temperature”, J. Am. Chem. Soc., DOI: 10.1021/jacs.8b06475 (2018).

• “Oxidized laser-induced graphene for efficient oxygen electrocatalysis”, Adv. Mater. 1707319, doi.org/10.1002/adma.201707319 (2018).

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WE GRATEFULLY ACKNOWLEDGE THE FOLLOWING EXTERNAL FUNDING AGENCIES FOR SUPPORTING RCQM ACTIVITIES