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

Ryan J. Gelly, Dylan Renaud, Xing Liao, Benjamin Pingault, Stefan Bogdanovic, Giovanni Scuri, Kenji Watanabe, Takashi Taniguchi, Bernhard Urbaszek, Hongkun Park () and Marko Lončar ()
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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
Marko Lončar: Harvard University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-021-27877-2

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