Sudden generation of anomalous anti-vortex states in a two-component superconductor

Abstract

We studied the influences of the inclusion of different geometrical defects (circle, triangle, and square) with different Ginzburg–Landau parameters [Formula: see text] on the vortex state of a mesoscopic superconducting square immersed in an external applied magnetic field. We calculated the magnetization, vorticity, and density of Cooper pairs for this system, solving the time-dependent Ginzburg–Landau equations. We found a novel and interesting behavior of the vorticity [Formula: see text] at low magnetic fields: a spontaneous generation of anti-vortices due to the breaking inversion symmetry.