Bose-Bose mixtures with synthetic spin-orbit coupling in optical lattices

作者：He, Liang^*; Ji, Anchun; Hofstetter, Walter

来源：Physical Review A, 2015, 92(2): 023630.

DOI：10.1103/PhysRevA.92.023630

We investigate the ground-state properties of Bose-Bose mixtures with Rashba-type spin-orbit (SO) coupling in a square lattice. The system displays rich physics from the deep Mott insulator (MI) all the way to the superfluid (SF) regime. In the deep MI regime, exotic spin-ordered phases arise due to the effective Dzyaloshinskii-Moriya type of superexchange interactions. By employing the nonperturbative bosonic dynamical mean-field theory (BDMFT), we numerically study and establish the stability of these magnetic phases against increasing hopping amplitude. We show that as hopping is increased across the MI to SF transition, exotic superfluid phases with magnetic textures emerge. In particular, we identify an exotic spin-spiral magnetic texture with spatial period 3 in the superfluid close to the MI-SF transition.

• 出版日期2015-8-24
• 单位首都师范大学