Physics Department

The University of Texas at Arlington

Department of Physics

• 21 Full Faculty, Two Full Time Lecturers• 52 Graduate Students (Ph.D. and MS)• 20 Senior Researchers and Post-Docs• 11 Full Time Technical and Clerical Staff

Department of Physics

B.A., Physics B.S., Physics M.S., Physics Ph.D., Physics and

Applied Physics

Degrees:

Over $6 Million per year in Federally Funded Research

Research Areas:• High Energy Physics• Astrophysics/Space Physics• Condensed Matter Experiment

• Nano-magnetic Materials• Nano-bio Materials• Nano-bio Optics• Surface Physics

• Condensed Matter Theory• Modeling of Nano-Materials• Modeling of Surfaces

Tuesday, Nov. 8, 2011 UTA Physics Department 5

High Energy Physics: Drs. Yu, De, Brant, White, Jackson, and Farbin

Geneva Airport

ATLAS

CMS

France

Swizerland

LHC @ CERN Aerial View

Tuesday, Nov. 8, 2011 UTA Physics Department

Fermilab Tevatron and LHC at CERN World’s Highest Energy proton-anti-proton collider

– 4km circumference– Ecm=1.96 TeV (=6.3x10-7J/p 13M Joules on the

area smaller than 10-4m2)– Equivalent to the kinetic energy of a 20t truck at

the speed 81mi/hr 130km/hr ~100,000 times the energy density at the ground 0 of the

Hiroshima atom bomb– Was shut down at 2pm CDT, Sept. 30, 2011

Other parts of the complex is still running!!

Chicago

Tevatron p

p CDF

DØ

• World’s Highest Energy p-p collider– 27km circumference, 100m underground– Design Ecm=14 TeV (=44x10-7J/p 362M

Joules on the area smaller than 10-6m2) Equivalent to the kinetic energy of a B727

(80tons) at the speed 193mi/hr 312km/hr ~300M times the energy density at the ground 0 of the

Hiroshima atom bomb• First 7TeV collisions on 3/30/10 The highest energy

humans ever achieved!!• Just completed a successful run this year!

6

Recent Excitement: Hint of the Higgs

UTA Physics Department 7

These red lines show how the LHC's Atlas experiment registered the arrival of four particles called muons. They could have been the byproducts of a short-lived Higgs boson--or they could have been more humdrum events. CERN's LHC particle accelerator will continue smashing protons into each other to spot the statistical significance that means the Higgs really has been found. (Credit: CERN)

Astrophysics

Search for extra-solar planets – Musielak and Cuntz X-ray telescope image of supernova - Park

Study of Supernova Remnants

~1-10 M deg hot gas: Observations using X-ray space telescopes (e.g., Chandra).

Studies of Supernova (SN) nucleosynthesis Chemical composition and Density structure of interstellar medium Cosmic-ray acceleration by SN shock Nature of neutron stars

X-ray Astronomy Supernova Remnants

Size ~17 pc ~ 57 light yearDistance ~ 6 kpc ~ 20000 light year Size ~0.3 pc ~ 1 light year

Neutron star

Tuesday, Nov. 8, 2011 9UTA Physics Department

Assist. Prof. Sangwook Park

Space Physics

Solar Wind

Magnetosphere

Ionosphere/Thermosphere

Ionosphere/Thermosphere Processes

Professor Ramon Lopez

Assist. Prof. Yue Deng

Condensed Matter Experiment– Internationally recognized in nano-magnetism, positron

physics, structure of actinides, fullerenes, photonic materials.

– Extensive funding, including multi-million dollar, multi-year DARPA and (2005 ) MURI grant awards for nano-structured magnetic materials.

Prof. Sharma Prof. Weiss Prof. Koymen

Assoc. Prof. ChenProf. Liu Assist. Prof. Mohanty

Prof. Sharma

The Smallest Permanent Magnets – Drs Liu & Koymen

-60 -40 -20 0 20 40 60-1000

-800

-600

-400

-200

0

200

400

600

800

1000

0.05 0.10 0.15 0.20 0.25

400

500

600

700

800

900

1000

M (

em

u/c

m3 )

H (kOe)

15 nm 8 nm 6 nm 4 nm

Ms

(em

u/cm

3 )

d-1 (nm-1)

Ferromagnetic nanoparticles (single domain and single crystal) have coercivity up to 3 Tesla!

We are able to produce world smallest permanent magnets down to 3 nm with large magnetic force!

Tuesday, Nov. 8, 2011 12UTA Physics Department

Nanodiamond and electro-optic materialsProfessor Suresh C Sharma

Diamond NPs grown by

chemical vapor deposition

Looking at diamond nanoparticles (size ~ 10-100 nm) with advanced tools of nanotechnology

Using lasers to synthesizeelectro-optic materials with sub-

micron scale periodic variations in refractive index used for advanced

optical devices

Nanotechnology For Health Care and Homeland Security – Dr. Chen

Tuesday, Nov. 8, 2011 14UTA Physics Department

15

Manipulation and imaging

- Optical tweezers (disease diagnosis, force sensing)

- Laser spanner (optofluidics, neuronal guidance)

- Optical stretcher (cellular biomechanics)

- Laser scissors (nano-surgery,)- Digital holographic microscopy

(refractive index measurement)

Advanced BiophotonicsTherapeutic control

- Photothermal therapy(gene delivery, damage cancer)

- Optogenetics (vision restoration, pain inhibition)

- DNA damage-repair (aging, new pathways )

- Nerve injury-repair (screening new molecules for regeneration)

Tuesday, Nov. 8, 2011 UTA Physics Department

NEW 2-METER T-O-F SPECTROMETER

“Secondary Electron”E1

Valence Band

E AMQS = E1 - E2 - φ-

Virtual photon

Scattering state

Surface state

E2

Vacuum Level

φ-

Direct trapping in the surface state potential well

Incident positrons

φ+

Surface potential

Metal Vacuum

Energy available to an electron at fermi level

(a) (b)

Vacuum Level

Figure1.Schematics of AMQS process a,b, (a)The slow positrons may be directly trapped in the surface state resulting in the release of an electron with the residual energy (b) the energy band diagram showing the Auger like transition where the incident positron drops down to fill an empty state while simultaneously kicking out a secondary electron.

Condensed Matter Theory

Modeled Nano-structures

Positron trapped at Si 7x7 surface

Theory prediction of new double walled SiC nanostructures

Materials discovery “by design”Application of Electronic Structure Theory to Materials in Renewable Energy

Complex quantum mechanical calculations to understand the Physics of materials.

Research Topics:1. Materials discovery for Renewable Energy technology.2. Nano-structures for future electronics and nano-technology.3. Physics for flexible electronics, which can be folded or deformed like paper.

e f g

Flexible Detectors on ROIC

3D Detectors

e f g

Flexible Detectors on ROIC

3D Detectors

PV-cell Nano-structures Flexible nano-structures.

Research are done in collaboration of National Renewable Energy Laboratory.

Assist. Prof. Huda

The People of the UTA Physics Department Welcome You!