Fermi surface effect on spontaneous breaking of time-reversal symmetry in unconventional superconducting films
| Autor: | Nobumi Miyawaki, Seiji Higashitani |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Physics
Condensed matter physics Condensed Matter - Superconductivity Spontaneous symmetry breaking FOS: Physical sciences Fermi surface Condensed Matter Physics Symmetry (physics) Electronic Optical and Magnetic Materials Superconductivity (cond-mat.supr-con) T-symmetry Phase (matter) Condensed Matter::Superconductivity Symmetry breaking Translational symmetry Phase diagram |
| DOI: | 10.48550/arxiv.1502.03521 |
| Popis: | We propose a mechanism that helps stabilize a superconducting state with broken time-reversal symmetry, which was predicted to realize in a d-wave superconducting film [A. B. Vorontsov, Phys. Rev. Lett. 102, 177001 (2009)]. In this superconducting phase, the time-reversal symmetry breaking is accompanied by spontaneous breaking of the translation symmetry along the film surface. We examine how the normal-superconducting phase boundary in the thickness-temperature phase diagram of the film is modified depending on the Fermi surface shape. In particular, the nonuniform superconducting phase is found to substantially extend to a smaller thickness region in the phase diagram when the Fermi surface satisfies a nesting condition. We demonstrate this Fermi surface effect using a square-lattice tight-binding model. Comment: 10 pages, 5 figures |
| Databáze: | OpenAIRE |
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