pi-Junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads

Details pi-Junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads pi-Junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads

2005-04-26

arxiv.org/abs/cond-mat/0504649v2

Phys. Rev. B 72, 174502 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 12 figures

Scientific paper

10.1103/PhysRevB.72.174502

We investigate the temperature- and coupling-dependent transport through Kondo dot contacts with symmetric superconducting s-wave leads. For finite temperature T we use a superconducting extension of a selfconsistent auxiliary boson scheme, termed SNCA, while at T=0 a perturbative renormalization group treatment is applied. The finite-temperature phase diagram for the 0--pi transition of the Josephson current in the junction is established and related to the phase-dependent position of the subgap Kondo resonance with respect to the Fermi energy. The conductance of the contact is evaluated in the zero-bias limit. It approaches zero in the low-temperature regime, however, at finite T its characteristics are changed through the coupling- and temperature-dependent 0--pi transition.

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