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29 March 2024
 
  » arxiv » 2109.08885

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Realization of Qi-Wu-Zhang model in spin-orbit-coupled ultracold fermions
Ming-Cheng Liang ; Yu-Dong Wei ; Long Zhang ; Xu-Jie Wang ; Han Zhang ; Wen-Wei Wang ; Wei Qi ; Xiong-Jun Liu ; Xibo Zhang ;
Date 18 Sep 2021
AbstractBased on the optical Raman lattice technique, we experimentally realize the Qi-Wu-Zhang model for quantum anomalous Hall phase in ultracold fermions with two-dimensional (2D) spin-orbit (SO) coupling. We develop a novel protocol of pump-probe quench measurement to probe, with minimal heating, the resonant spin flipping on particular quasi-momentum subspace called band-inversion surfaces. With this protocol we demonstrate a continuous crossover between 1D and 2D SO couplings by tuning the relative phase between two coherent Raman couplings, and detect the non-trivial topological band structures by varying the two-photon detuning. The non-trivial band topology is also observed by slowly loading the atoms into optical Raman lattices and measuring the spin textures. Our results show solid evidence for the realization of the minimal SO-coupled quantum anomalous Hall model, which can provide a feasible platform to investigate novel topological physics including the correlation effects with SO-coupled ultracold fermions.
Source arXiv, 2109.08885
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