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Moiré excitons in MoSe2-WSe2 heterobilayers and heterotrilayers

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  • Michael Förg

    (Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München)

  • Anvar S. Baimuratov

    (Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München)

  • Stanislav Yu. Kruchinin

    (Center for Computational Materials Sciences, Faculty of Physics, University of Vienna
    Nuance Communications Austria GmbH)

  • Ilia A. Vovk

    (Center of Information Optical Technology, ITMO University)

  • Johannes Scherzer

    (Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München)

  • Jonathan Förste

    (Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München)

  • Victor Funk

    (Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München)

  • Kenji Watanabe

    (Research Center for Functional Materials, National Institute for Materials Science)

  • Takashi Taniguchi

    (International Center for Materials Nanoarchitectonics, National Institute for Materials Science)

  • Alexander Högele

    (Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München
    Munich Center for Quantum Science and Technology (MCQST))

Abstract

Layered two-dimensional materials exhibit rich transport and optical phenomena in twisted or lattice-incommensurate heterostructures with spatial variations of interlayer hybridization arising from moiré interference effects. Here, we report experimental and theoretical studies of excitons in twisted heterobilayers and heterotrilayers of transition metal dichalcogenides. Using MoSe2-WSe2 stacks as representative realizations of twisted van der Waals bilayer and trilayer heterostructures, we observe contrasting optical signatures and interpret them in the theoretical framework of interlayer moiré excitons in different spin and valley configurations. We conclude that the photoluminescence of MoSe2-WSe2 heterobilayer is consistent with joint contributions from radiatively decaying valley-direct interlayer excitons and phonon-assisted emission from momentum-indirect reservoirs that reside in spatially distinct regions of moiré supercells, whereas the heterotrilayer emission is entirely due to momentum-dark interlayer excitons of hybrid-layer valleys. Our results highlight the profound role of interlayer hybridization for transition metal dichalcogenide heterostacks and other realizations of multi-layered semiconductor van der Waals heterostructures.

Suggested Citation

  • Michael Förg & Anvar S. Baimuratov & Stanislav Yu. Kruchinin & Ilia A. Vovk & Johannes Scherzer & Jonathan Förste & Victor Funk & Kenji Watanabe & Takashi Taniguchi & Alexander Högele, 2021. "Moiré excitons in MoSe2-WSe2 heterobilayers and heterotrilayers," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21822-z
    DOI: 10.1038/s41467-021-21822-z
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