dc Josephson current through a quantum dot coupled with superconducting leads

Satoshi Ishizaka, Jun’ichi Sone, and Tsuneya Ando
Phys. Rev. B 52, 8358 – Published 15 September 1995
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Abstract

The transport in a superconductor–quantum-dot–superconductor tunnel junction with a Coulomb repulsion in the dot was studied numerically. We calculated the dc Josephson current by noncrossing approximations varying the strength of the Coulomb repulsion. The critical current has a peak structure that is a function of the energy-level position in the dot, but the number of the peaks changes depending on the temperature, the strength of electron tunneling, and the Coulomb repulsion. It has been predicted previously that the junction behaves as a π junction for an infinitely strong Coulomb repulsion. We obtained the conditions for the strength of the Coulomb repulsion necessary for the π junction.

  • Received 20 April 1995

DOI:https://doi.org/10.1103/PhysRevB.52.8358

©1995 American Physical Society

Authors & Affiliations

Satoshi Ishizaka and Jun’ichi Sone

  • NEC Fundamental Research Laboratories, 34 Miyukigaoka, Tsukuba, Ibaraki 305, Japan

Tsuneya Ando

  • Institute for Solid State Physics, University of Tokyo, 7-22-11 Roppongi, Minato-ku, Tokyo 106, Japan

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Issue

Vol. 52, Iss. 11 — 15 September 1995

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