Ground-state phase diagram and critical temperature of two-component Bose gases with Rashba spin-orbit coupling
Zeng-Qiang Yu
2013
Physical Review A. Atomic, Molecular, and Optical Physics
Ground-state phase diagram of two-component Bose gases with Rashba spin-orbit coupling is determined via a variational approach. A phase in which the fully polarized condensate occupies zero momentum is identified. This zero-momentum phase competes with the spin density wave phase when interspecies interaction is stronger than intraspecies interaction, and the former one is always the ground state for weak spin-orbit coupling. When the energies of these two phases are close, there is a phase
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... aration between them. At finite temperature, such a zero-momentum condensation can be induced by a ferromagnetic phase transition in normal state. The spontaneous spin polarization removes the degeneracy of quasiparticles' energy minima, and consequently the modified density of state accommodates a Bose condensation to appear below a critical temperature.
doi:10.1103/physreva.87.051606
fatcat:ynclzaww7jhblhpsqhfsskpnkm