Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: TR: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1

TT 47.5: Vortrag

Donnerstag, 17. März 2011, 11:30–11:45, HSZ 304

Real time Effective-action approach to the Anderson quantum dot — •Denes Sexty, Thomas Gasenzer, and Jan Pawlowski — ITP Uni Heidelberg, Deutschland

The non-equilibrium time evolution of an Anderson quantum dot coupled between two leads forming a chemical-potential gradient for fermions is investigated. We use Kadanoff-Beym dynamic equations derived from the two-particle irreducible effective action with a non-perturbative resummation of the s-channel bubble chains. The effect of the resummation is shown to be equivalent to the introduction of a frequency dependent 4-point vertex. The tunneling to the leads is taken into account exactly, without further approximations. The method allows the determination of the transient as well as stationary transport through the quantum dot, and results are compared to different schemes (fRG, ISPI, tDMRG and QMC) for different values of the interactions between the fermions.