Diagrammatic perturbation technique for a quantum dot connected to superconducting leads

0430517 - FZÚ 2014 RIV PL eng C - Conference Paper (international conference)
Pokorný, Vladislav - Janiš, Václav - Novotný, T. - Žonda, M.
Diagrammatic perturbation technique for a quantum dot connected to superconducting leads.
Acta Physica Polonica A, vol. 126, 2014, č. 1. Warsaw: Polish Academy of Sciences, 2014, s. 352-353. ISSN 0587-4246. E-ISSN 1898-794X.
[Czech and Slovak Conference on Magnetism /15./. Košice (CZ), 17.06.2013-21.06.2013]
R&D Projects: GA ČR GCP204/11/J042
Institutional support: RVO:68378271
Keywords : superconductivity * quantum dots * perturbation expansion * Josephson junction
Subject RIV: BM - Solid Matter Physics ; Magnetism

We study the spectral properties of a quantum dot embedded between two superconductors showing a phase difference. The system is described as a single-impurity Anderson model coupled to BCS superconducting leads. We utilize diagrammatic perturbation techniques in the Coulomb interaction to capture the relevant physical phenomena, particularly the effect of Coulomb interaction on the Andreev bound states present in the electronic spectrum. Results of the Hartree - Fock approximation and the random phase approximation at zero temperature are presented.
Permanent Link: http://hdl.handle.net/11104/0235485