Physics 795: Condensed Matter Theory. Ralf Bundschuh Jason Ho C. Jayaprakash Julia Meyer Bruce Patton Bill Putikka Mohit Randeria Will Saam David Stroud Nandini Trivedi John Wilkins. Condensed Matter Theorists @ OSU. B. Patton. C. Jayaprakash. R. Bundschuh. J. Ho. J. Meyer.
& J. Wilkins
[ meso = somewhere in between micro & macro ]
Interactions and disorder
in low-dimensional & nanostructured systems
- deviations from one-dimensionality
in interacting quantum wires
- ultracold dipolar gases in optical lattices
- proximity effect in
MY GROUP: 1 graduate student [ possibly one more opening ! ]
+ looking for one postdoc
Spin Lifetimes in Semiconductors
Quantum many-body systems
- High Tc superconductors
Group members: Rajdeep Sensarma (PhD student)
Roberto Diener (Post-doctoral research associate)
Some of the most challenging problems in condensed matter today deal with new phases of matter generated by strong interactions between the constituents. Disorder in such correlated systems can produce novel effects.
Condensed Matter Theory
How do many electrons organise themselves?
The magic of quantum mechanics and statistical mechanics!
NEW PHASES AND
QUANTUM PHASE TRANSITIONS
Techniques: semianalytical; Quantum Monte Carlo techniques
Kohjiro Kobayashi- Metal Insulator transition
Rajdeep SenSarma – High Tc Superconductivity
(jointly with M. Randeria)
Vamsi Akkineni – BCS-BEC Crossover in Ultracold Atoms
(jointly with D. Ceperley, Urbana)
Tim Arnold– Nano Superconductors
Eric Wolf– Dynamics of quantum systems
Other collaborations on Superconductor-Insulator Transition (Berkeley);
Optical Lattices (ISSP, Tokyo and Trento, Italy)
every Friday at noon
E-mail ME IF YOU ARE INTERESTED
Opening for at least
1 grad student
Predicting bandgap offsets of semiconductor heterostructures. The aim is to provide predictive data for scientists and engineers designing new semiconductor devices. Currently there is lot of trial and error (called combinatorial synthesis) to find desired band gaps and the offset of valence and conduction bands. Current method are seldom better than a factor of two (useless!).
Predicting defect formation and evolution in semiconductors and metals. Today we have simple pictures that we believe are quantitative for motion of small interstitial clusters in silicon and alpha->omega phase transition in titanium. Interest in the first is to eventually understand how large defects are formed. [Generally these are undesirable. Knowing the path might lead to blocking it.] In titanium, omega phase is brittle. This transition needs to be inhibited. Current success is again thru experimentally combinatorial methods. Anything that could shorten the process is a step forward.
To simulate large system -- necessary for reality -- models are necessary. We are exploiting quantum Monte Carlo methods (that, in principle can be exact) to benchmark these models. Viewgraph at http://www.physics.ohio-state.edu/~wilkins/junk/qmc.html shows one example.
Broad range of computational approaches model defect-induced properties aimed at predicting and improving properties.
Benchmarking methods are essential to ensure model predictions are reliable.
This double focus needs a range of skills and interest from pure to applied.
Tin-Lun (Jason) Ho
Fundamental issues in dilute quantum gases: Scalar and Spinor Bose condensates, Fermi gases with large spin, mixtures of quantum gases in optical lattice and rapidly rotating potential, Boson mesoscopics, processing quantum information with spinor Bose condensates; Quantum Hall effects with internal degrees of freedom; Strongly correlated electron systems; Quantum fluids
Nonequilibrium phenomena; Fully developed turbulence; Strongly interacting fermion systems
Bruce R. Patton
Structure and properties of electroceramics; Grain growth in anisotropic systems; Pattern recognition and optimization
William F. Saam
Phase transitions at interfaces: wetting and roughening transitions; Step interactions on solid surfaces and consequent phase transitions