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TT: Fachverband Tiefe Temperaturen

TT 46: Quantum Dots, Quantum Wires, Point Contacts

TT 46.1: Vortrag

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

Spectral and transport properties of superconducting quantum dots — •Vladislav Pokorný¹ and Martin Žonda² — ¹Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 18221 Praha, Czech Republic — ²Institute of Physics, Albert Ludwig University of Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany

We study the effects of electron correlations on a system consisting of one or two single-level quantum dots attached to superconducting leads. We use the superconducting Anderson impurity model to study the system and solve it using the self-consistent, second-order perturbation theory method as well as the hybridization-expansion, continuous-time quantum Monte Carlo (CT-HYB) and the numerical renormalization group (NRG). We study the behavior of the Andreev subgap states, the Josephson current and the fate of the zero-pi (singlet-doublet) quantum phase transition and compare the results of different methods, setting the limits of their reliability in various regimes.