Berezinskii-Kosterlitz-Thoules phase transition of spin-orbit coupled Fermi gas in optical lattice
1 Beijing Computational Science Research Center - Beijing, 100084, China
2 Department of Physics, The Chinese University of Hong Kong - Hong Kong, China
Received: 14 May 2014
Accepted: 22 July 2014
We use a determinant quantum Monte Carlo simulation and a mean-field approach to study the Rashba spin-orbit coupled Fermi gases in square optical lattice. Notably, we show that the Berezinskii-Kosterlitz-Thoules phase transition temperature can be enhanced by the spin-orbit coupling. The superfluidity is always dominated by spin-singlet pairing when the attraction or the spin-orbit coupling increases. Moreover, the spin susceptibility is shown to be anisotropic and attends a steady value in the presence of the spin-orbit coupling.
PACS: 03.75.Ss – Degenerate Fermi gases / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 02.70.Ss – Quantum Monte Carlo methods
© EPLA, 2014