Theory of heterotic SIS Josephson junctions between single- and multi-gap superconductors

Details Theory of heterotic SIS Josephson junctions between single- and multi-gap superconductors Theory of heterotic SIS Josephson junctions between single- and multi-gap superconductors

2009-03-03

arxiv.org/abs/0903.0421v3

Phys. Rev. Lett. 102, 237003 (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.102.237003

Using the functional integral method, we construct a theory of heterotic SIS Josephson junctions between single- 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 $\pm$ 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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