Phase diagram of a uniform two-dimensional Fermi gas with spin-orbit coupling

作者：Yang Xiaosen^*; Wan Shaolong

来源：Physical Review A, 2012, 85(2): 023633.

DOI：10.1103/PhysRevA.85.023633

We investigate the ground state of a uniform two-dimensional polarized Fermi gas with Rashba spin-orbit coupling at zero temperature. We construct the phase diagram by comparing the thermodynamic potential of superfluid and phase-separated states in detail. Due to the competition between polarization and spin-orbit coupling, we find that phase-separated states in the phase diagram can be topologically trivial and nontrivial. These two topologically distinct phase-separated states can not be connected without topological phase transition. The spin-orbit coupling reduces the effect of the population imbalance. Therefore, the phase-separated states are unstable to the superfluid phases for a large spin-orbit coupling.

• 出版日期2012-2-24