Structure of vortex lattices in rotating two-component Bose–Einstein condensates

Abstract We investigate numerically the structure of vortex lattices in rotating two-component Bose–Einstein condensates with equal intraspecies interaction strengths g11=g22. The stationary solutions of the coupled Gross–Pitaevskii equations with a centrifugal term show various non-trivial patterns of vortex lattices, depending on the interspecies interaction strength g12. For g 11 g 22 >g 12 the vortices in each condensate form a vortex lattice, and one lattice is shifted from the other to reduce the overlap of the condensates. For g 11 g 22 12 when the phase separation of the condensate occurs, the vortex lattices are destroyed, forming the vortex sheet structure. The dynamics of vortex lattice formation is also discussed.