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TT: Fachverband Tiefe Temperaturen

TT 3: Transport: Quantum Dots, Quantum Wires, Point Contacts

TT 3.1: Talk

Monday, March 20, 2017, 09:30–09:45, HSZ 201

Unconventional superconductivity in quantum dot systems — •Stephan Weiss and Jürgen König — Theoretische Physik, Universität Duisburg-Essen and CENIDE, 47048 Duisburg, Germany

For ultra-small quantum dots we study the interplay between spin degrees of freedom and induced superconducting correlations in a nonequilibrium transport setup. Several scenarios of reduced spin symmetry and the consequences for induced even- and odd-frequency order parameters, the Andreev current as well as the shot noise are discussed. Spin symmetry is either reduced by external magnetic fields and/or ferromagnetic leads [1]. Due to the reduced level structure, the single dot case differs from the recently studied double dot system [2].

[1] S. Weiss and J. König, submitted (2016).

[2] B. Sothmann, S. Weiss, M. Governale, J. König, Phys. Rev. B 90, 220501 (2014).