Massless and quantized modes of kinks in the phase space of superconducting gaps
| Autor: | Yanagisawa, Takashi, Hase, Izumi, Tanaka, Yasumoto |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physics Letters A382, 3483 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physleta.2018.10.008 |
| Popis: | We investigated quantized modes of kinks in the phase space of superconducting gaps in a superconductor with multiple gaps. The kink is described by the sine-Gordon model in a two-gap superconductor and by the double sine-Gordon model in a three-gap superconductor. A fractional-flux vortex exists at the edge of the kink, and a fractional-flux vortex will be stable in a three-gap superconductor with time-reversal symmetry breaking. The kink and fractional-flux vortex exhibit massless modes as a sliding motion. We show further that there are one zero-energy mode (massless mode) and quantized excitation modes in kinks, which are characteristic features of multi-gap superconductors. The equation of quantized modes for the double sine-Gordon model is solved numerically. The correction to the ground-state energy is calculated based on the renormalization theory. Comment: 9 pages, 8 figures |
| Databáze: | arXiv |
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