2013/10/07 by Takashi Yanagisawa, Yasumoto Tanaka, Yanagisawa, Takashi +4
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #Topological Materials and Phenomena #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1310.1674
Proceedings of the 12th Asia and Pacific Physics Conference (2013)
arxiv created 2013/10/07 · arxiv updated 2013/10/08
Multi-phase physics is a new physics of multi-gap superconductors. Multi-band superconductors exhibit many interesting and novel properties. We investigate the dynamics of the phase-difference mode and show that this mode yields a new excitation mode. The phase-difference mode is represented as an abelian vector field. There are massless modes when the number of gaps is greater than three and the Josephson term is frustrated. The fluctuation of phase-difference modes with non-trivial topology leads to the existence of a fractional-quantum flux vortex in a magnetic field. A superconductor with a fractional-quantum flux vortex is regarded as a topological superconductor with the integer Chern number.