Regensburg 2019 – wissenschaftliches Programm
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.