Theory of Heterotic Superconductor-Insulator-Superconductor Josephson Junctions between Single- and Multiple-Gap Superconductors
Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto
DOI 10.1103/PhysRevLett.102.237003 · Physical Review Letters
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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.
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