Ground states of a mixture of pseudospin-1/2 Bose gases with interspecies spin exchange

摘要

In this paper, we analytically find the ground states of a mixture of two species of pseudospin-1/2 Bose gases with interspecies spin exchange in quite generic parameter regimes. In the most interesting phase, the ground state is strongly entangled between the two species in a very wide parameter regime, and is an entangled Bose-Einstein condensate. The phase diagram and elementary excitations are studied.