Mixed phases in U(N) superconductivity
Mixed phases in U(N) superconductivity
We consider a general class of type-II superconductors which are described by $N$ complex order parameters (OP's), with an overall $U(N)$ symmetry for the energy functional. In the lowest-energy state, each OP adopts its own particular lattice structure, making the spatial variation of the overall condensate very complex. We present …