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TT: Fachverband Tiefe Temperaturen

TT 29: Nonequilibrium Quantum Many-Body Systems 2 (joint session TT/DY)

TT 29.5: Vortrag

Dienstag, 17. März 2020, 15:00–15:15, HSZ 204

Iterative path integral summations for nonequilibrium quantum transport — •Stephan Weiss, Simon Mundinar, and Jürgen König — Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg

We have developed a numerically exact scheme, the Iterative Summation of Path-Integrals (ISPI), to calculate observable of interest in quantum transport setups out of equilibrium [1,2]. Our main focus aims at small interacting quantum dot systems which are coupled to ferromagnetic [2] as well as superconducting leads in a nonequilibrium environment. We take into account small to intermediate Coulomb interactions, finite lead polarizations as well as finite superconducting gap parameters and finite temperature for the respective setups. Our method treats spin-dependent resonant-tunnelling processes in a natural manner. Examples of the tunnelling current are presented for different setups.

[1] S. Weiss, R. Hützen, D. Becker, J. Eckel, R. Egger, and M. Thorwart, Phys. Stat. Sol. B 250, 2298 (2013).

[2] S. Mundinar, Ph. Stegmann, J. König, and S. Weiss, Phys. Rev. B 99, 195457 (2019).