Article Impact of temperature on the brightening of neutral and charged dark excitons in WSe2 monolayer

Łucja Kipczak ORCID ; Natalia Zawadzka ORCID ; Dipankar Jana ORCID ; Igor Antoniazzi ORCID ; Magdalena Grzeszczyk ORCID ; Małgorzata Zinkiewicz ORCID ; Kenji Watanabe SAMURAI ORCID ; Takashi Taniguchi SAMURAI ORCID ; Marek Potemski ORCID ; Clément Faugeras ORCID ; Adam Babiński ORCID ; Maciej R. Molas ORCID

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Łucja Kipczak, Natalia Zawadzka, Dipankar Jana, Igor Antoniazzi, Magdalena Grzeszczyk, Małgorzata Zinkiewicz, Kenji Watanabe, Takashi Taniguchi, Marek Potemski, Clément Faugeras, Adam Babiński, Maciej R. Molas. Impact of temperature on the brightening of neutral and charged dark excitons in WSe2 monolayer. Nanophotonics. 2024, 13 (26), 4743-4749. https://doi.org/10.1515/nanoph-2024-0385

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(abstract)

The optically dark states play an important role in the electronic and optical properties of mono- layers (MLs) of semiconducting transition metal dichalcogenides. The effect of temperature on the in-plane-field activation of the neutral and charged dark excitons is investigated in a WSe2 ML encapsulated in hexagonal BN flakes. The brightening rates of the neutral dark (XD) and grey (XG) excitons and the negative dark trion (TD) differ substantially at a particular temperature, but more importantly they vanish considerably by almost 5 orders of magnitude with the temperature increased from 4.2 K to 100 K. The quenching of the dark-related emissions is accompanied by the two-order-of-magnitude enlargement of the neutral bright counterparts, i.e. neutral bright exciton (XB) and spin-singlet (TS) and spin-triplet (TT) negative trions, due to the thermal activations of dark states. Furthermore, the energy splittings between the dark XD and TD complexes and the corresponding bright XB, TS, and TT ones vary with temperature increases from 4.2 K to 100 K. This can be explained in terms of the different exciton-phonon couplings for the bright and dark excitons because of the different symmetry properties of such excitons.

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Keyword: Dark states, excitons, temperature depend

Date published: 2024-12-05

Publisher: Walter de Gruyter GmbH

Journal:

  • Nanophotonics (ISSN: 21928614) vol. 13 issue. 26 p. 4743-4749

Funding:

  • Japan Society for the Promotion of Science 21H05233
  • Japan Society for the Promotion of Science 23H02052
  • Fundacja na rzecz Nauki Polskiej IRA, FENG.02.01-IP.05-5 T004/23
  • Centre National de la Recherche Scientifique IRP ‘2DM’
  • Narodowe Centrum Nauki 2018/31/B/ST3/02111
  • World Premier International Research Center Initiative MEXT
  • Polish Ministry of Education and Science DIR/WK/2018/07
  • CEZAMAT Warsaw University of Technology CENTERA2

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1515/nanoph-2024-0385

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Updated at: 2025-02-05 16:30:27 +0900

Published on MDR: 2025-02-05 16:30:27 +0900

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