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TT: Fachverband Tiefe Temperaturen

TT 75: Poster Session: Transport 1

TT 75.1: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-EG

Keldysh-FRG Approach for Inhomogeneous One-Dimensional Fermi Systems with Finite-Ranged Interactions — •Lukas Weidinger, Dennis Schimmel, and Jan von Delft — LMU München, Theresienstraße 37, München

In a previous paper (arXiv:1609.07423), we have introduced an extended coupled-ladder approximation (eCLA) scheme for 2nd-order truncated functional renormalization group (fRG) calculations in the Matsubara formalism, capable of treating finite-ranged interactions. We applied it in a static approximation and at zero temperature to models of quantum point contacts (QPCs) and quantum dots (QDs).

In this poster, we present our current follow-up work on the implementation of a dynamical eCLA within the Keldysh formalism. We pursue this for two main reasons: First, to get additional insights by obtaining real-frequency data, allowing us, for example, to compute the interacting local density of states (LDOS). This enables us also to study the finite-temperature behavior of the conductance which turned out to be unfeasible in Matsubara fRG. Second, within the Keldysh formalism we are able to study non-equilibrium effects, e.g. by applying finite source-drain voltages or temperature gradients to our systems.