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Dynamically tunable moiré exciton in monolayer WSe<sub>2</sub> on twisted bilayer graphene

ORAL

Abstract

Excitons arranged in periodic arrays are highly desired for various quantum optoelectronics application. Moiré quantum materials provide an ideal setting where excitons can be trapped by the deep moiré potential with engineered periodicity. Yet, a system with dynamically tunable moiré potential is to be demonstrated. In this talk, we present realization of a tunable moiré potential in a monolayer WSe2 that are enabled by its adjacent twisted bilayer graphene (tBLG). We observe a set of emergent moiré exciton Rydberg states at finite doping of tBLG, with their energy splitting increasing with tBLG doping. These observation can be understood as a result of enhanced moiré potential with tBLG doping. Our work opens new possibilities in engineering of the moiré potential in a monolayer semiconductor.

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Presenters

  • Minhao He

    Princeton University

Authors

  • Minhao He

    Princeton University

  • Jiaqi Cai

    University of Washington

  • Huiyuan Zheng

    The University of Hong Kong

  • Eric Seewald

    Columbia University

  • 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

  • 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

  • Jiaqiang Yan

    Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Matthew A Yankowitz

    University of Washington

  • Abhay N Pasupathy

    Brookhaven National Laboratory & Columbia University, Columbia University

  • Wang Yao

    The University of Hong Kong

  • Xiaodong Xu

    University of Washington