Coupling of excitons and electric polarization in a moiré TMD homobilayer

ORAL

Abstract

Transition metal dichalcogenide (TMD) moiré systems host a variety of strongly correlated electronic states and display novel light-matter interactions. TMD hetero- and homo-bilayers have distinct crystal symmetries, with homobilayers exhibiting higher symmetry at the expense of an indirect bandgap in most cases. However, twisted MoTe2 (tMoTe2) retains its direct bandgap and strong optical response. Using various optical probes, we show intertwined doping and electric field effects on excitons in tMoTe2 arising from control over the layer symmetry. We also report on optical signatures of the crossover regime between the layer-degenerate and layer-polarized states of the system. This study establishes tMoTe2 system as a promising system to explore excitonic physics within a highly tunable layer-degenerate moiré system.

*This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1762114.

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Presenters

  • William G Holtzmann

    • University of Washington

Authors

  • William G Holtzmann

    • University of Washington

  • Eric Anderson

    • University of Washington

  • Feng-ren Fan

    • The University of Hong Kong

  • 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

  • Wang Yao

    • The University of Hong Kong

  • Xiaodong Xu

    • University of Washington