Theory of heterotic superconductor-insulator-superconductor Josephson junctions between single- and multiple-gap superconductors

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Using the functional integral method, we construct a theory of heterotic superconductor-insulator-superconductor Josephson junctions between one- and two-gap superconductors. The theory predicts the presence of in-phase and out-of-phase collective oscillation modes of superconducting phases. The former corresponds to the Josephson plasma mode whose frequency is drastically reduced for ± s-wave symmetry, and the latter is a counterpart of Leggett's mode in Josephson junctions. We also reveal that the critical current and the Fraunhofer pattern strongly depend on the symmetry type of the two-gap superconductor.

Original languageEnglish
Article number237003
JournalPhysical Review Letters
Volume102
Issue number23
DOIs
Publication statusPublished - 2009 Jun 12

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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