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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.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: moiré excitons
, WS2/WSe2 heterostructure
, pump-probe spectroscopy


Date published: 2025-02-06

Publisher: Springer Science and Business Media LLC

Journal:

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

Funding:

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

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

MDR DOI:

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

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Updated at: 2026-02-17 08:30:21 +0900

Published on MDR: 2026-02-16 18:00:53 +0900