Flux quantization for a vortex in two-gap superconductor

Abstract

Contrary to recent theoretical prediction, we show that the magnetic flux of a vortex in SU(2) model of two-gap superconductor is quantized in units of 2π/g, not 4 π/g. For the U(1) version of this model, the flux is quantized in units of 2 πα/g where 0 < α< 1. The parameter αdepends on the masses and concentrations of the Cooper pairs in the two condensates.

arXiv comment7 pages

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