One-dimensional Fermi liquid and symmetry breaking in the vortex core
Makhlin Yu. G. , Volovik G. E.
Fermions localized within vortex cores can form one-dimensional Fermi liquids. The nonzero density of states in these Fermi liquids can lead to instability of the symmetric structure of the vortex core. We consider a symmetry breaking which is obtained due to spontaneous admixture of the spin-triplet p-wave component of the order parameter in a conventional s-wave vortex in the presence of a magnetic field. This occurs at a rather low temperature and leads to an asymmetric shape of the vortex core. A similar phenomenon of symmetry breaking induced by core fermions occurs in electroweak Ζ strings.8 © 1995