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Transcript
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
