Singular length dependence of critical current in superconductor/normal- metal/superconductor bridges

Alex Levchenko, Alex Kamenev, Leonid Glazman

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We examine the dependence of the critical Josephson current on the length L of the normal bridge N between two bulk superconductors. This dependence turns out to be nonanalytic at small L. The nonanalyticity originates from the contribution of extended quasiparticle states with energies well above the superconducting gap. This should be contrasted with the more familiar contribution to the Josephson current coming from Andreev bound states localized in the normal region at energies below the gap.

Original languageEnglish (US)
Article number212509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number21
DOIs
StatePublished - 2006

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