Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 101: Transport - Poster Session
TT 101.1: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Non-equilibrium transport through a QD using Keldysh-fRG — •Dennis Schimmel1,2, Florian Bauer1,2, Jan Heyder1,2, and Jan von Delft1,2 — 1Arnold Sommerfeld Center München — 2LMU München, Germany
The functional renormalization group (fRG) is a powerful resummation technique which recasts the computation of diagrams into a diffential equation. We apply the non-equilibrium (Keldysh) version of it to a single impurity Anderson model and analyze various choices of the flow parameter. We focus on the weakly interacting region to establish the quality of the fRG-scheme. From previous studies, it is known that the truncation involved in fRG schemes inevitably leads to a violation of the particle-conservation law. As a consequence of this, physical quantities need to be computed without resorting to derivations using the particle-conservation law, unless the quantitative violation is negligible. The scheme used here can readily be generalized to quantum chain models, e.g. to treat nonequilibrium transport through (weakly) interacting quantum wires.