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Probing dark exciton navigation through a local strain landscape in a WSe2 monolayer

Author

Listed:
  • Ryan J. Gelly

    (Harvard University)

  • Dylan Renaud

    (Harvard University)

  • Xing Liao

    (Harvard University)

  • Benjamin Pingault

    (Harvard University)

  • Stefan Bogdanovic

    (Harvard University)

  • Giovanni Scuri

    (Harvard University)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Bernhard Urbaszek

    (Université de Toulouse, INSA-CNRS-UPS, LPCNO)

  • Hongkun Park

    (Harvard University
    Harvard University)

  • Marko Lončar

    (Harvard University)

Abstract

In WSe2 monolayers, strain has been used to control the energy of excitons, induce funneling, and realize single-photon sources. Here, we developed a technique for probing the dynamics of free excitons in nanoscale strain landscapes in such monolayers. A nanosculpted tapered optical fiber is used to simultaneously generate strain and probe the near-field optical response of WSe2 monolayers at 5 K. When the monolayer is pushed by the fiber, its lowest energy states shift by as much as 390 meV (>20% of the bandgap of a WSe2 monolayer). Polarization and lifetime measurements of these red-shifting peaks indicate they originate from dark excitons. We conclude free dark excitons are funneled to high-strain regions during their long lifetime and are the principal participants in drift and diffusion at cryogenic temperatures. This insight supports proposals on the origin of single-photon sources in WSe2 and demonstrates a route towards exciton traps for exciton condensation.

Suggested Citation

  • Ryan J. Gelly & Dylan Renaud & Xing Liao & Benjamin Pingault & Stefan Bogdanovic & Giovanni Scuri & Kenji Watanabe & Takashi Taniguchi & Bernhard Urbaszek & Hongkun Park & Marko Lončar, 2022. "Probing dark exciton navigation through a local strain landscape in a WSe2 monolayer," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-021-27877-2
    DOI: 10.1038/s41467-021-27877-2
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    References listed on IDEAS

    as
    1. Artur Branny & Santosh Kumar & Raphaël Proux & Brian D Gerardot, 2017. "Deterministic strain-induced arrays of quantum emitters in a two-dimensional semiconductor," Nature Communications, Nature, vol. 8(1), pages 1-7, August.
    2. Carmen Palacios-Berraquero & Dhiren M. Kara & Alejandro R.-P. Montblanch & Matteo Barbone & Pawel Latawiec & Duhee Yoon & Anna K. Ott & Marko Loncar & Andrea C. Ferrari & Mete Atatüre, 2017. "Large-scale quantum-emitter arrays in atomically thin semiconductors," Nature Communications, Nature, vol. 8(1), pages 1-6, August.
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    Cited by:

    1. Emanuil S. Yanev & Thomas P. Darlington & Sophia A. Ladyzhets & Matthew C. Strasbourg & Chiara Trovatello & Song Liu & Daniel A. Rhodes & Kobi Hall & Aditya Sinha & Nicholas J. Borys & James C. Hone &, 2024. "Programmable nanowrinkle-induced room-temperature exciton localization in monolayer WSe2," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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