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<p>The moiré superlattice formed by van der Waals (vdW) stacking of two-dimensional (2D) monolayers with a twist angle can give rise to a variety of novel correlated physical phenomena. In this study, we propose that a 2D semiconductor composed of vdW layers with band edge states extended into the interlayer region can host time-reversal-invariant topological states, as demonstrated by density functional theory and tight-binding calculations. This emergent physics in moiré superlattices is experimentally verified in a twisted bilayer InSe with a twisting angle of <i>θ</i> = 7.34°. Using scanning tunneling microscopy/spectroscopy (STM/STS), we observed topological edge modes associated with the Z<sub>2</sub> topological metal state at the moiré domain boundary, while these states are absent in the bilayer without twisting. Our theoretical predictions and experimental discoveries advance the field of moiré physics and twistronics, offering a promising strategy for the creation of moiré topological devices.</p>

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Real-space observation of a time-reversal invariant topological state in twisted bilayer InSe

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月27日

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  • Dacheng Tian,
  • Shengdan Tao,
  • Yu Wang,
  • Peng Cheng,
  • Yiqi Zhang,
  • Kehui Wu,
  • Zeying Zhang,
  • Shengyuan A. Yang,
  • Baojie Feng,
  • Yunhao Lu,
  • Lan Chen

摘要

The moiré superlattice formed by van der Waals (vdW) stacking of two-dimensional (2D) monolayers with a twist angle can give rise to a variety of novel correlated physical phenomena. In this study, we propose that a 2D semiconductor composed of vdW layers with band edge states extended into the interlayer region can host time-reversal-invariant topological states, as demonstrated by density functional theory and tight-binding calculations. This emergent physics in moiré superlattices is experimentally verified in a twisted bilayer InSe with a twisting angle of θ = 7.34°. Using scanning tunneling microscopy/spectroscopy (STM/STS), we observed topological edge modes associated with the Z2 topological metal state at the moiré domain boundary, while these states are absent in the bilayer without twisting. Our theoretical predictions and experimental discoveries advance the field of moiré physics and twistronics, offering a promising strategy for the creation of moiré topological devices.