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Article overview
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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 | Abstract: | Based 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 | Services: | Forum | Review | PDF | Favorites |
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