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Low dimensionality has non-trivial effects on Coulomb interaction. One attractive platform to investigate 2D-Coulomb interaction is the excitons in monolayer transition metal dichalcogenides (1L-TMDs). 1L-TMD excitons are known to have non-hydrogenic level structures. However, no empirical rule that universally describes exciton level structures in various 1L-TMD systems has been obtained from experiments. Here, we conducted sum frequency generation spectroscopies on four 1L-MX2 (M=Mo, W, X=S, Se) thin films encapsulated by hBN, and simultaneously observed s-series and p-series exciton levels. From the obtained energies, we extracted excitonic parameters, such as binding energies and average radii, with help of numerical calculations considering dielectric screening in 2D and band structure. We found a simple and non-trivial power-law scaling between obtained excitonic parameters. The power-law scaling is understood as an approximate form of the virial theorem which strictly holds for 3D hydrogen models. This result indicates that dielectric screening of hBN is the main factor that governs 1L-TMD exciton level structure.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Excitons, sum frequency generation spectroscopy, dielectric screening

刊行年月日: 2024-11-08

出版者: Springer Science and Business Media LLC

掲載誌:

• Scientific Reports (ISSN: 20452322) vol. 14 issue. 1 27286

研究助成金:

• Japan Society for the Promotion of Science JP17H06124
• Japan Society for the Promotion of Science JP21H05233
• Japan Society for the Promotion of Science JP20H02573
• Japan Science and Technology Agency JPMJMI17F2
• Japan Science and Technology Agency JPMJCR17I5
• Ministry of Education, Culture, Sports, Science and Technology JPMXS0118067634

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41598-024-77625-x

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更新時刻: 2025-02-05 12:30:34 +0900

MDRでの公開時刻: 2025-02-05 12:30:34 +0900