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Electronic and Excitonic Behaviors in WSe<sub>2</sub>/WS<sub>2</sub> Hetero-bilayers as a Function of Moiré Wavelength

ORAL

Abstract

Moiré patterning of Transitional metal dichalcogenide van der Waals heterostructures provides a way to engineer tunable flat bands that host correlated electronic and excitonic phases. We fabricated “continuously twisted” hetero-bilayers by integrating large area WS2 flakes together with narrow WSe2 ribbons that are bent by a nano-manipulator. Fabrication of heterostructures with continuous variation of twisted angle and moiré wavelength, not only makes a precise control of the twisted angle achievable, but also provides a platform to study the behaviors of electrons and excitons in WSe2/WS2 hetero-bilayers as a function of the moiré wavelength of the superlattice.

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Presenters

  • Birui Yang

    Columbia University

Authors

  • Birui Yang

    Columbia University

  • William G Holtzmann

    University of Washington

  • Xinyi Xu

    Columbia Universtiy, Columbia University, Department of Mechanical Engineering, Columbia University, New York, NY, USA

  • Song Liu

    Columbia University

  • Takashi Taniguchi

    National Institute for Materials Science, Kyoto Univ, International Center for Materials Nanoarchitectonics, National Institute of Materials Science, Kyoto University, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Science, Japan, National Institute For Materials Science, NIMS, National Institute for Material Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Kenji Watanabe

    National Institute for Materials Science, Research Center for Functional Materials, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, NIMS, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • James C Hone

    Columbia University

  • P J Schuck

    Columbia University, Department of Mechanical Engineering, Columbia University, New York, NY, USA

  • Xiaodong Xu

    University of Washington

  • Cory R Dean

    Columbia Univ, Columbia University