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Hot excitons are usually neglected in optical spectroscopy in 2D semiconductors for the sake of momentum conservation, as the majority of hot excitons are out of light cones. In this letter, we elaborate the contribution of hot excitons to optical properties in monolayer transition metal dichalcogenides (TMDs) with photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopy. With the intensity-dependent PL, temperature-dependent PL and PLE experiments combined with the simulations, we experimentally distinguish the influences of the exciton temperature and the lattice temperature in the PL spectrum. It is concluded that the acoustic phonon assisted photoluminescence accounts for the non-Lorentzian high energy tail of the PL spectrum and the hot exciton effect is significant even at linear optical properties of TMDs. Besides, the effective exciton temperature is found to be several tens of Kelvin higher than the lattice temperature at non-resonant optical excitation which may indicate that the exciton temperature needs to be carefully taken into account when considering the exciton related strong correlated phenomenon such as exciton condensation. Finally, we found the effective exciton temperature can be well tuned by excitation energy.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Hot excitons, photoluminescence spectroscopy, transition metal dichalcogenides

刊行年月日: 2022-11-29

出版者: Wiley

掲載誌:

• Natural Sciences (ISSN: 26986248) vol. 3 issue. 1 e20220035

研究助成金:

• Glaucoma Research Foundation 17300520

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/ntls.20220035

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更新時刻: 2025-03-01 12:30:11 +0900

MDRでの公開時刻: 2025-03-01 12:30:12 +0900