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<p>Molybdenum ditelluride (MoTe<sub>2</sub>) has recently emerged as a quantum material platform, especially exhibiting the fractional quantum anomalous Hall (FQAH) effect and unconventional superconductivity in its twisted bilayer configuration. However, a deep understanding of the strong many-body correlations and superconductivity in this system requires systematic real-space studies of the electronic and structural properties of few-layer MoTe<sub>2</sub> by scanning tunneling microscopy (STM). This remains challenging due to the high air-sensitivity of MoTe<sub>2</sub> and the difficulties associated with STM device fabrication. Here, we adopted an encapsulation strategy employing monolayer hexagonal boron nitride (hBN) that enabled atomic-scale characterization of air-sensitive MoTe<sub>2</sub> devices via scanning probe techniques. This approach allowed us to probe both natural and twisted bilayer MoTe<sub>2</sub> (tMoTe<sub>2</sub>) (with twist angle <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44214_2025_86_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="68" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mi>θ</mi> <mo>=</mo> <msup> <mn>2.35</mn> <mo>∘</mo> </msup> </math></EquationSource> <EquationSource Format="TEX">$\theta = 2.35^{\circ}$</EquationSource> </InlineEquation>) directly while preserving their intrinsic electronic states. Our high-resolution scanning tunneling spectroscopy (STS) measurements detected the extremely weak valence band at the K-valley, in agreement with large-scale density functional theory (DFT) calculations. This work not only establishes a framework for studying air-sensitive quantum materials but also provides fundamental insights into moiré-engineered correlated and topological states in van der Waals heterostructures.</p>

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Real-space study of monolayer hBN encapsulated bilayer MoTe2 devices

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月25日

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  • Yufeng Liu,
  • Yu Gu,
  • Ting Bao,
  • Ning Mao,
  • Shudan Jiang,
  • Liang Liu,
  • Dandan Guan,
  • Yaoyi Li,
  • Hao Zheng,
  • Canhua Liu,
  • Kenji Watanabe,
  • Takashi Taniguchi,
  • Wenhui Duan,
  • Jinfeng Jia,
  • Shengwei Jiang,
  • Xiaoxue Liu,
  • Yang Zhang,
  • Tingxin Li,
  • Can Li,
  • Shiyong Wang

摘要

Molybdenum ditelluride (MoTe2) has recently emerged as a quantum material platform, especially exhibiting the fractional quantum anomalous Hall (FQAH) effect and unconventional superconductivity in its twisted bilayer configuration. However, a deep understanding of the strong many-body correlations and superconductivity in this system requires systematic real-space studies of the electronic and structural properties of few-layer MoTe2 by scanning tunneling microscopy (STM). This remains challenging due to the high air-sensitivity of MoTe2 and the difficulties associated with STM device fabrication. Here, we adopted an encapsulation strategy employing monolayer hexagonal boron nitride (hBN) that enabled atomic-scale characterization of air-sensitive MoTe2 devices via scanning probe techniques. This approach allowed us to probe both natural and twisted bilayer MoTe2 (tMoTe2) (with twist angle θ = 2.35 ∘ $\theta = 2.35^{\circ}$ ) directly while preserving their intrinsic electronic states. Our high-resolution scanning tunneling spectroscopy (STS) measurements detected the extremely weak valence band at the K-valley, in agreement with large-scale density functional theory (DFT) calculations. This work not only establishes a framework for studying air-sensitive quantum materials but also provides fundamental insights into moiré-engineered correlated and topological states in van der Waals heterostructures.