Josephson-phase-controlled interplay between correlation effects and electron pairing in a three-terminal nanostructure

0482133 - FZÚ 2018 RIV US eng J - Journal Article
Domański, T. - Žonda, M. - Pokorný, Vladislav - Górski, G. - Janiš, Václav - Novotný, T.
Josephson-phase-controlled interplay between correlation effects and electron pairing in a three-terminal nanostructure.
Physical Review B. Roč. 95, č. 4 (2017), s. 1-11, č. článku 045104. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA ČR GA15-14259S
Institutional support: RVO:68378271
Keywords : Schrieffer-Wolf transformation * quantum dot * Anderson model * superconductivity * quantum Monte-Carlo
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.813, year: 2017

We study the subgap spectrum of the interacting single-level quantum dot coupled between two superconducting reservoirs, forming the Josephson-type circuit, and additionally hybridized with a metallic normal lead. This system allows for the phase-tunable interplay between the correlation effects and the proximity-induced electron pairing resulting in the singlet-doublet (0-pi) crossover and the phase-dependent Kondo effect. We investigate the spectral function, induced local pairing, Josephson supercurrent, and Andreev conductance in a wide range of system parameters by the numerically exact numerical renormalization group and quantum Monte Carlo calculations along with perturbative treatments in terms of the Coulomb repulsion and the hybridization term. Our results address especially the correlation effects reflected in dependencies of various quantities on the local Coulomb interaction strength as well as on the coupling to the normal lead.

Permanent Link: http://hdl.handle.net/11104/0277537