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Deep Moiré Potentials in Twisted TMD heterobilayers

ORAL

Abstract

Twisted transition metal dichalcogenides (TMD) heterobilayers are a powerful platform to study interlayer excitonic states and charge confinement due to long wavelength periodic potentials produced by moiré patterns. Here we report the experimental observation of deep (>0.3 eV) moiré potentials in WSe2/MoSe2 heterobilayers using scanning tunneling microscopy (STM). We investigated the structural and electronic properties of nearly R-stacked (0 degree) and H-stacked (60 degrees) at small twist angles. Our spectroscopic measurements demonstrate a non-monotonic dependence of the moiré potential as a function of moiré wavelength in H-stacked heterobilayers. This non-monotonicity is directly linked to a drastic change in the structure of the moiré unit cell and the emergence of one-dimensional soliton domain walls at long moiré wavelength. We find that the magnitude of the moiré potential cannot be explained solely by interlayer hybridization, but is instead dominated by the three-dimensional structure and strain present within individual moiré unit cells.

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Presenters

  • Sara Shabani

    Physics, Columbia University, Columbia Univ, Columbia University

Authors

  • Sara Shabani

    Physics, Columbia University, Columbia Univ, Columbia University

  • Dorri Halbertal

    Columbia University, Columbia Univ, Physics, Columbia University

  • Wenjing Wu

    Department of Chemistry, Columbia University, Columbia Univ, Columbia University

  • Mingxing Chen

    Hunan normal university, Hunan Normal University

  • Song Liu

    Columbia University, Mechanical Engineering, Columbia, Department of Mechanical Engineering, Columbia University, Columbia Univ

  • James Hone

    Columbia Univ, Columbia University, Department of Mechanical Engineering, Columbia University, Mechanical Engineering, Columbia University

  • Wang Yao

    The University of Hong Kong, the University of Hong Kong, University of Hong Kong, Department of Physics, The University of Hong Kong

  • Dmitri Basov

    Columbia University, Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ

  • Xiaoyang Zhu

    Columbia University, Chemistry, Columbia university, Chemistry, Columbia University, Department of Chemistry, Columbia University

  • Abhay Narayan

    Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ, Department of Physics, Columbia University, New York, New York 10027, USA, Columbia University