Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 62: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1

TT 62.6: Talk

Thursday, March 23, 2017, 10:45–11:00, HSZ 304

Thermoelectric response of the correlated layer - non-equilibrium DMFT study — •Irakli Titvinidze, Antonius Dorda, Wolfgang von der Linden, and Enrico Arrigoni — Institute of theoretical and computational physics, Graz Univeristy of Technology, 8010 Graz, Austria.

Here we investigate the effect of the interaction on the thermoelectric properties of a system, consisting of the single correlated layer sandwiched between two metallic leads. First we investigate linear response. We present our results for the seebeck coefficient, electrical and thermal conductance. Later on, we consider a finite temperature difference between the left and right leads. We study dependence of the current on the electronic filing of the central layer for zero bias voltage and current-voltage characteristics close to the half-filling. We obtain that strong interactions enhance thermoelectric effects, in both cases. Our results are obtained via non-equilibrium dynamical mean-field theory [1]. As an impurity solver we use auxiliary master equation approach [2], which addresses the impurity problem within an auxiliary system consisting of a correlated impurity, a small number of uncorrelated bath sites, and two Markovian environments described by a generalized master equation.

[1] P. Schmidt and H. Monien, ArXiv:cond-mat/0202046;
J. K. Freericks, Phys. Rev. B 77, 075109 (2008)

[2] E. Arrigoni et al, Phys. Rev. Lett. 110, 086403 (2013);
A. Dorda et al, Phys. Rev. B. 89, 165105 (2014);
I. Titvinidze et al., PRB 92, 245125 (2015)