Abstract Molybdenum ditelluride (MoTe 2) 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 2 by scanning tunneling microscopy (STM). This remains challenging due to the high air-sensitivity of MoTe 2 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 2 devices via scanning probe techniques. This approach allowed us to probe both natural and twisted bilayer MoTe 2 (tMoTe 2) (with twist angle = 2. 35^ θ = 2. 35 ∘) 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.
Liu et al. (Thu,) studied this question.