Josephson Effect in a Coulomb-blockaded SINIS Junction

Details Josephson Effect in a Coulomb-blockaded SINIS Junction Josephson Effect in a Coulomb-blockaded SINIS Junction

2005-11-07

arxiv.org/abs/cond-mat/0511168v1

Pis'ma Zh. Eksp. Teor. Fiz. 82, 863 (2005) [JETP Lett. 82, 763 (2005)]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 EPS figures, JETP Letters style file included

Scientific paper

10.1134/1.2175245

The problem of Josephson current through Coulomb-blocked nanoscale superconductor-normal-superconductor structure with tunnel contacts is reconsidered. Two different contributions to the phase-biased supercurrent are identified, which are dominant in the limits of weak and strong Coulomb interaction. Full expression for the free energy valid at arbitrary Coulomb strength is found. The current derived from this free energy interpolates between known results for weak and strong Coulomb interaction as phase bias changes from 0 to pi. In the broad range of Coulomb strength the current-phase relation is substantially non-sinusoidal and qualitatively different from the case of semi-ballistic SNS junctions. Coulomb interaction leads to appearance of a local minimum in the current at some intermediate value of phase difference applied to the junction.

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