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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 14.1: Vortrag
Montag, 20. März 2017, 15:00–15:15, HSZ 201
Correlation effects in two and three-terminal superconducting nanostructures — •Vladislav Pokorny1 and Martin Žonda2 — 1Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic — 2Faculty of Mathematics and Physics, Charles University in Prague, Czech Republic
We study the effects of electron correlations on a system consisting of a single-level quantum dot attached to two superconducting and, optionally, a third metallic lead. We use the single-impurity Anderson model coupled to BCS superconducting leads to study this system and solve it using a self-consistent second-order perturbation theory method as well as the hybridization-expansion, continuous-time quantum Monte Carlo and the numerical renormalization group. We study the behavior of the Andreev subgap states, the Josephson current and the zero-pi quantum phase transition and set the limits of usability of the methods. We also show the agreement of various methods with the available experimental results.