Kondo effect and Josephson current through a quantum dot between two superconductors

Mahn-Soo Choi, Minchul Lee, Kicheon Kang, W. Belzig

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a π- to a 0-phase as the coupling increases. At intermediate couplings the total spin in the ground state depends on the phase difference between the two superconductors. Our numerical results can explain the crossover in the conductance observed experimentally by Buitelaar et al. [Phys. Rev. Lett. 89, 256801 (2002)].

Original languageEnglish
Article number020502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number2
DOIs
Publication statusPublished - 2004 Jul 1

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Kondo effect
Ground state
Superconducting materials
Semiconductor quantum dots
quantum dots
Switches
renormalization group methods
crossovers
switches
ground state

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Kondo effect and Josephson current through a quantum dot between two superconductors. / Choi, Mahn-Soo; Lee, Minchul; Kang, Kicheon; Belzig, W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 2, 020502, 01.07.2004.

Research output: Contribution to journalArticle

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