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 c...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 angleθ=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.展开更多
基金supported by the National Key R&D Program of China(Nos.2022YFA1405400,2022YFA1402401,2022YFA1402404,2021YFA1401400,2022YFA1402702,2021YFA1400100,2020YFA0309000,2024YFF0727103)the National Natural Science Foundation of China(Nos.22325203,12350403,12174249,12174250,12141404,92265102,12374045,92365302,92265105,92065201,12074247,12174252,22272050,21925201,12304230)+5 种基金the Innovation Program for Quantum Science and Technology(Nos.2021ZD0302600 and 2021ZD0302500)the Natural Science Foundation of Shanghai(No.22ZR1430900)S.W.,T.L.and X.L.acknowledge the Shanghai Jiao Tong University 2030 Initiative Program.X.L.acknowledges the Pujiang Talent Program 22PJ1406700T.L.acknowledges the Yangyang Development Fund.Y.Z.acknowledges support from AI-Tennessee and Max Planck partner lab grant on quantum materials.C.L.acknowledges China Postdoctoral Science Foundation(No.GZB20230422)N.M.acknowledges the support from the Alexander von Humboldt Foundation.K.W.and T.T.acknowledge support from the JSPS KAKENHI(Nos.21H05233 and 23H02052)World Premier International Research Center Initiative(WPI),MEXT,Japan.
文摘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 angleθ=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.
