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This letter reports a time-resolved pump-probe reflectance spectroscopic study on moiré excitons in a twisted monolayer WS₂/WSe₂ heterostructure. By probing at the resonant energies of intralayer excitons, we observed their distinct temporal tracks under the influence of interlayer excitons, which we attribute to the discrepancy in spatial distribution of the intralayer excitons in different layers. We also observed that intralayer moiré excitons in the WSe₂ layer differ at decay rate, which reflects different locations of Wannier-like and charge-transfer intralayer excitons in a moiré cell. We concluded that the interlayer moiré excitons form within a few picoseconds and have lifetimes exceeding five nanoseconds. Our results provide insights into the nature of moiré excitons and the strain’s significant impact on their behaviour in twisted heterostructures, which could have important implications for the development of novel optoelectronic devices.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: moiré excitons
, WS2/WSe2 heterostructure
, pump-probe spectroscopy


刊行年月日: 2025-02-06

出版者: Springer Science and Business Media LLC

掲載誌:

• Quantum Frontiers (ISSN: 20974051) vol. 4 issue. 1 2

研究助成金:

• Research Grants Council, University Grants Committee AoE/P-701/20, 17300520, 17301223
• Key Technologies Research and Development Program 2020YFA0309600

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1007/s44214-025-00075-7

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更新時刻: 2026-02-17 08:30:21 +0900

MDRでの公開時刻: 2026-02-16 18:00:53 +0900