Download Simulating Steady-State Strongly correlated Nonlinear Transport

Binghamton University
Department of Physics, Applied Physics and Astronomy
Department of Materials Science and Engineering
PHYSICS COLLOQUIUM
Jong E. Han
Assistant Professor, Department of Physics
SUNY Buffalo
“Simulating Steady-State Strongly correlated Nonlinear Transport”
Jong E. Han
Abstract:
In recent years, formal theory of nonequilibrium electronic transport has received considerable interest. We are now
on the verge of making breakthrough advancements of computational techniques for nonlinear transport, reminiscent of
situations in the 1980-1990’s when powerful numerical tools revolutionized the equilibrium quantum many-body theory.
We introduce basic concepts on electron correlations in condensed matter physics and review available methods to
calculate electron transport physics.
As an important step toward the nonequilibrium theory, I show that there exists a time-independent quantum theory
via the imaginary-time formalism which can be implemented for general quantum dot models. By introducing Matsurbara
voltage, the operators governing nonequilibrium statistics and the real-time dynamics can be formulated in a single
framework. By numerically implementing this new idea via quantum Monte Carlo technique, I demonstrate that we finally
have an essentially exact numerical method for calculating strongly correlated nonlinear transport in nanoscale devices
such as the Kondo anomaly in quantum dot systems.
Monday, October 15, 2007
S2 Bldg. Room 243
PRESENTATION 2:30 PM– 3:30PM
ALL WELCOME – COFFEE AND REFRESHMENTS AT 2:20PM