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<p>In moiré materials with flat electronic bands and suitable quantum geometry, strong correlations can give rise to various topological states of matter. The non-trivial band topology of twisted MoTe<sub>2</sub>, which is responsible for its fractional quantum anomalous Hall states, is predicted to arise from a skyrmion lattice texture in the layer pseudospin of the electronic wavefunctions. Tracing the layer polarization of wavefunctions within the moiré unit cell can, thus, offer insights into the band topology. Here we measure the out-of-plane component of the layer-pseudospin skyrmion textures of twisted MoTe<sub>2</sub> using scanning tunnelling microscopy and spectroscopy. We do this by simultaneously visualizing the moiré lattice structure and the spatial localization of its electronic states. We find that the wavefunctions associated with the topological flat bands exhibit a spatially dependent layer polarization within the moiré unit cell, in agreement with our theoretical modelling. Our work enables future local probe studies of the intertwined correlated and topological states arising in gate-tunable devices.</p>

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Microscopic signatures of topology in twisted MoTe2

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Ellis Thompson,
  • Keng Tou Chu,
  • Florie Mesple,
  • Xiao-Wei Zhang,
  • Chaowei Hu,
  • Yuzhou Zhao,
  • Heonjoon Park,
  • Jiaqi Cai,
  • Eric Anderson,
  • Kenji Watanabe,
  • Takashi Taniguchi,
  • Jihui Yang,
  • Jiun-Haw Chu,
  • Xiaodong Xu,
  • Ting Cao,
  • Di Xiao,
  • Matthew Yankowitz

摘要

In moiré materials with flat electronic bands and suitable quantum geometry, strong correlations can give rise to various topological states of matter. The non-trivial band topology of twisted MoTe2, which is responsible for its fractional quantum anomalous Hall states, is predicted to arise from a skyrmion lattice texture in the layer pseudospin of the electronic wavefunctions. Tracing the layer polarization of wavefunctions within the moiré unit cell can, thus, offer insights into the band topology. Here we measure the out-of-plane component of the layer-pseudospin skyrmion textures of twisted MoTe2 using scanning tunnelling microscopy and spectroscopy. We do this by simultaneously visualizing the moiré lattice structure and the spatial localization of its electronic states. We find that the wavefunctions associated with the topological flat bands exhibit a spatially dependent layer polarization within the moiré unit cell, in agreement with our theoretical modelling. Our work enables future local probe studies of the intertwined correlated and topological states arising in gate-tunable devices.