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説明:

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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Dark states, excitons, temperature depend

刊行年月日: 2024-12-05

出版者: Walter de Gruyter GmbH

掲載誌:

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

研究助成金:

• 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

原稿種別: 出版者版 (Version of record)

MDR DOI:

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

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更新時刻: 2025-02-05 16:30:27 +0900

MDRでの公開時刻: 2025-02-05 16:30:27 +0900