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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Electrons - Poster Session
TT 79.25: Poster
Wednesday, April 2, 2014, 15:00–19:00, P2
Kondo regime of the non-equilibrium time evolution of an Anderson quantum dot — •Sebastian Bock1,2, Alexander Liluashvili1,2, Denes Sexty1,2, and Thomas Gasenzer1,2 — 1Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
We study the Kondo regime of the non-equilibrium time evolution of an Anderson quantum dot. The quantum dot is coupled between two leads forming a chemical-potential gradient and the tunneling to the leads is taken into account exactly. We apply the functional-integral approach based on the Schwinger-Keldysh closed time path integral to derive the Kadanoff-Baym dynamic equations from the two-particle irreducible (2PI) effective action. The dynamic equations are derived in non-perturbative approximation of the resummation of direct, particle-particle, and particle-hole channels. The effect of the resummation leads to the introduction of a frequency-dependent 4-point vertex. The method allows the determination of the transient as well as stationary transport through the quantum dot. We study, in particular, the Kondo regime of strong on-site repulsion and low leads-temperature, focusing on the narrowing of the Kondo resonance.