Abstract
Recent experiments in ultracold atoms have reported the realization of quantum anomalous Hall phases in spin-orbit coupled systems. Motivated by such advances, we investigate spin-orbit coupled Bose-Bose mixtures in a two-dimensional square optical Raman lattice. Complete phase diagrams are obtained via a nonperturbative real-space bosonic dynamical mean-field theory. Various quantum phases are predicted, including Mott phases with z-ferromagnetic, xy-antiferromagnetic and vortex textures, and superfluid phases with the exotic spin orders, induced by the competition between the lattice hopping and spin-orbit coupling. To explain the underlying physics in the Mott regime, an effective Hamiltonian is derived based on second-order perturbation theory, where pseudospin order stems from the interplay of effective Dzyaloshinskii-Moriya superexchange and Heisenberg interactions. In the presence of the Zeeman field, the competition of strong interaction and Zeeman energy facilitates a topological phase, which is confirmed both by the nontrivial topological Bott index and spectral function with topological edge states. Our work indicates that spin-orbit coupling can induce rich non-Abelian topological physics in strongly correlated ultracold atomic systems.
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This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403200), the NSAF (Grant Nos. U1830206, and U1930403), the National Natural Science Foundation of China (Grant Nos. 11774429, 12174093, and 12074431), the Science and Technology Innovation Program of Hunan Province (Grant No. 2021RC4026), and the Excellent Youth Foundation of Hunan Scientific Committee (Grant No. 2021JJ10044). The authors thank Xiong-Jun Liu, Liang He and Tao Qin for the helpful discussion.
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Han, J., Wang, X., Tan, H. et al. Interaction-induced topological transition in spin-orbit coupled ultracold bosons. Sci. China Phys. Mech. Astron. 66, 293012 (2023). https://doi.org/10.1007/s11433-023-2166-y
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DOI: https://doi.org/10.1007/s11433-023-2166-y