Layer-hybridized correlated insulating states in a WS<sub>2</sub>/WSe<sub>2</sub> moiré superlattice

ORAL

Abstract

In moiré superlattices of transitional metal dichalcogenides (TMD), the enhanced Coulomb interaction gives rise to rich correlated electronic states such as Mott insulators and generalized Wigner crystals. The introduction of layer degree of freedom to the moiré superlattice presents a new method to tune the electronic correlation, exemplified by phenomena like the excitonic insulator in monolayer WS2/bilayer WSe2. In this talk, we study angle-aligned monolayerWS2/trilayer WSe2 heterostructure in a dual gate geometry and employ microwave impedance microscopy to probe the formation of insulating states. We observe correlated insulating states atfilling factors of, n=-1/3, -2/3, -1 and -2. Notably, these states exhibit insensitivity to the hole distribution among WSe2 layers, which is controlled by the applied vertical electric field. This result suggests the formation of layer-hybridized correlated states in the heterostructure, with each hole shared between the first and third layer WSe2 via interlayer hopping of hole with same spin and valley indices. The hybridization across layers is also supported by the observation of hybridization of interlayer and intralayer excitons in the trilayer WSe2.

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Presenters

  • Qiran Wu

    • University of California, Riverside

Authors

  • Qiran Wu

    • University of California, Riverside

  • Dongxue Chen

    • SUSTC

  • Zhen Lian

    • Rensselaer Polytechnic Institute

  • Xiong Huang

    • Columbia University

  • Yuze Meng

    • Rensselaer Polytechnic Institute

  • Li Yan

    • Rensselaer polytechnic institute
    • Rensselaer Polytechnic Institute

  • Takashi Taniguchi

    • Kyoto Univ
    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Sciences
    • NIMS
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, NIMS, Japan
    • International Center for Materials Nanoarchitectonics, Tsukuba
    • National Institue for Materials Science
    • Kyoto University
    • National Institute of Materials Science
    • International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • Research Center for Electronic and Optical Materials, National Institute for Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science

  • Sufei Shi

    • Rensselaer Polytechnic Institute

  • Yongtao Cui

    • University of California, Riverside