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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 101: Transport - Poster Session

TT 101.1: Poster

Thursday, April 3, 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 Delft1,21Arnold 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.

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