Spectral and transport properties of a half-filled Anderson impurity coupled to phase-biased superconducting and metallic leads

0547677 - FZÚ 2022 RIV US eng J - Journal Article
Zalom, Peter - Pokorný, Vladislav - Novotný, T.
Spectral and transport properties of a half-filled Anderson impurity coupled to phase-biased superconducting and metallic leads.
Physical Review B. Roč. 103, č. 3 (2021), č. článku 035419. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT LTC19045; GA ČR GA19-13525S
Research Infrastructure: e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : superconductivity * quantum dot * numerical renormalization group * Josephson junction
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.908, year: 2021
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.103.035419

We derive and apply a general scheme for mapping a setup consisting of a half-filled single-level quantum dot coupled to one normal metallic and two superconducting phase-biased leads onto an ordinary half-filled single impurity Anderson model with single modified tunneling density of states. The theory allows for the otherwise unfeasible application of the standard numerical renormalization group and enables us to obtain phase-dependent local spectral properties as well as phase-dependent induced pairing and Josephson current. The resulting transport properties match well with the numerically exact continuous-time hybridization-expansion quantum Monte Carlo. For weakly coupled normal electrode, the spectral properties can be interpreted in terms of normal-electrode-broadened Andreev bound states with phase-dependent position analogous to the superconducting Anderson model, which coexist in the pi-like phase with a Kondo peak whose phase-dependent Kondo temperature is extracted.
Permanent Link: http://hdl.handle.net/11104/0323942