Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Quantum Dots, Quantum Wires, Point Contacts

TT 46.8: Vortrag

Mittwoch, 3. April 2019, 17:00–17:15, H22

Resonant transport through interacting proximitized quantum dots — •Stephan Weiss and Jürgen König — Theoretische Physik, Universität Duisburg-Essen and CENIDE, 47048 Duisburg, Germany

For a single level quantum dot that is resonantly coupled to a normal and a superconducting metal, we have calculated the current voltage characteristics. Numerically exact results are obtained within the iterative summation of path integrals (ISPI) [1] scheme. It builds upon the truncation of exponentially vanishing real-time correlations at finite temperature and/or bias voltage. Thereafter, the calculation of emerging partial spin traces along the Keldysh contour are performed in an iterative manner. Within the quantum regime, i.e. if there is no small parameter, ISPI calculations are performed to deduce the impact of Coulomb interactions, change of temperature, as well as gate voltage on the Andreev bound state spectrum for finite gap parameter Δ in a nonequilibrium situation.
[1] S. Weiss, et. al, Phys. Status Solidi B, 250 (11), 2298-2314 (2013).
[2] S. Weiss and J. König, in preparation (2018).