Diagrammatic Perturbation Technique for a Quantum Dot Connected to Superconducting Leads

• Authors: V. Pokorný , V. Janiš , T. Novotný , M. Žonda
• Languages of publication: EN

Abstracts

EN

We study spectral properties of a quantum dot attached to two superconductors with nonzero phase difference. The system is described as a single-impurity Anderson model coupled to BCS superconducting leads. We utilize diagrammatic perturbation expansion in the Coulomb interaction to capture relevant physical phenomena, particularly the effect of the Coulomb interaction on the Andreev bound states present in the electronic spectrum. Results of the Hartree-Fock and the random phase approximations at zero temperature are presented.

Keywords

EN

71.15.-m; 73.21.La; 74.50.+r

Discipline

• 74.50.+r: Tunneling phenomena; Josephson effects(for SQUIDs, see 85.25.Dq; for Josephson devices, see 85.25.Cp; for Josephson junction arrays, see 74.81.Fa)
• 71.15.-m: Methods of electronic structure calculations(see also 31.15.-p Calculations and mathematical techniques in atomic and molecular physics; for electronic structure calculations of superconducting materials, see 74.20.Pq)
• 73.21.La: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 352-353

Dates

published

2014-07

Contributors

author

V. Pokorný

• Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Prague, Czech Republic

author

V. Janiš

• Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Prague, Czech Republic

author

T. Novotný

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 12116 Prague, Czech Republic

author

M. Žonda

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 12116 Prague, Czech Republic

References

• [1] C. Karrasch, A. Oguri, V. Meden, Phys. Rev. B 77, 024517 (2008), doi: 10.1103/PhysRevB.77.024517
• [2] A. Martín-Rodero, A. Levy Yeyati, Adv. Phys. 60, 899 (2011), doi: 10.1080/00018732.2011.624266
• [3] A.C. Hewson, The Kondo Problem to Heavy Fermions, Cambridge Univ. Press, Cambridge (1993), doi: 10.1017/CBO9780511470752

Identifiers

DOI

10.12693/APhysPolA.126.352