Interaction-induced topological transition in spin-orbit coupled ultracold bosons  

作　　者：Jinsen Han Xiansi Wang Hui Tan Rui Cao Jiayu Dai Yongqiang Li Jianmin Yuan 

机构地区：[1]Department of Physics,National University of Defense Technology,Changsha 410073,China [2]Hunan Key Laboratory of Extreme Matter and Applications,National University of Defense Technology,Changsha 410073,China [3]School of Physics and Electronics,Hunan University,Changsha 410082,China [4]Department of Physics,Graduate School of China Academy of Engineering Physics,Beijing 100193,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第9期50-56,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：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);the Excellent Youth Foundation of Hunan Scientific Committee(Grant No.2021JJ10044)。

摘　　要：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 efective Hamiltonian is derived based on second-order perturbation theory,where pseudospin order stems from the interplay of efective 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.

关 键 词：ultracold gases optical lattices topological phase transition strongly correlated system 

分 类 号：O469[理学—凝聚态物理]