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Twist-angle dependence of moiré excitons in WS2/MoSe2 heterobilayers

Author

Listed:
  • Long Zhang

    (University of Michigan)

  • Zhe Zhang

    (University of Michigan
    Fudan University)

  • Fengcheng Wu

    (University of Maryland)

  • Danqing Wang

    (University of Michigan)

  • Rahul Gogna

    (University of Michigan)

  • Shaocong Hou

    (University of Michigan)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Krishnamurthy Kulkarni

    (University of Michigan)

  • Thomas Kuo

    (University of Michigan)

  • Stephen R. Forrest

    (University of Michigan
    University of Michigan)

  • Hui Deng

    (University of Michigan
    University of Michigan)

Abstract

Moiré lattices formed in twisted van der Waals bilayers provide a unique, tunable platform to realize coupled electron or exciton lattices unavailable before. While twist angle between the bilayer has been shown to be a critical parameter in engineering the moiré potential and enabling novel phenomena in electronic moiré systems, a systematic experimental study as a function of twist angle is still missing. Here we show that not only are moiré excitons robust in bilayers of even large twist angles, but also properties of the moiré excitons are dependant on, and controllable by, the moiré reciprocal lattice period via twist-angle tuning. From the twist-angle dependence, we furthermore obtain the effective mass of the interlayer excitons and the electron inter-layer tunneling strength, which are difficult to measure experimentally otherwise. These findings pave the way for understanding and engineering rich moiré-lattice induced phenomena in angle-twisted semiconductor van der Waals heterostructures.

Suggested Citation

  • Long Zhang & Zhe Zhang & Fengcheng Wu & Danqing Wang & Rahul Gogna & Shaocong Hou & Kenji Watanabe & Takashi Taniguchi & Krishnamurthy Kulkarni & Thomas Kuo & Stephen R. Forrest & Hui Deng, 2020. "Twist-angle dependence of moiré excitons in WS2/MoSe2 heterobilayers," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19466-6
    DOI: 10.1038/s41467-020-19466-6
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    Cited by:

    1. Shivangi Shree & Delphine Lagarde & Laurent Lombez & Cedric Robert & Andrea Balocchi & Kenji Watanabe & Takashi Taniguchi & Xavier Marie & Iann C. Gerber & Mikhail M. Glazov & Leonid E. Golub & Bernha, 2021. "Interlayer exciton mediated second harmonic generation in bilayer MoS2," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Biswajit Datta & Mandeep Khatoniar & Prathmesh Deshmukh & Félix Thouin & Rezlind Bushati & Simone Liberato & Stephane Kena Cohen & Vinod M. Menon, 2022. "Highly nonlinear dipolar exciton-polaritons in bilayer MoS2," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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