Distinct moiré exciton dynamics in WS2/WSe2 heterostructure
Abstract This letter reports a time resolved pump-probe reflectance spectroscopic study on moiré excitons in a twisted monolayer WS 2 /WSe 2 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 WSe 2 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 the lifetime 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.
Authors
- Xiaodong Cui (ORCID: https://orcid.org/0000-0002-2013-8336)
- Yuhui Yang (ORCID: https://orcid.org/0000-0001-6682-6006)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Xiong Wang (ORCID: https://orcid.org/0000-0002-0677-7983)
- Ying-Ming Xie (ORCID: https://orcid.org/0000-0002-2902-4896)
- Yao Wang (ORCID: https://orcid.org/0000-0002-3440-1801)
- Hongyi Yu
- Kai Feng (ORCID: https://orcid.org/0009-0005-5414-8152)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
Institutions
- Sun Yat-sen University (CN)
- Hong Kong University of Science and Technology (HK)
- National Institute for Materials Science (JP)
- University of Hong Kong (HK)
Publication Details
- Journal
- Quantum Frontiers
- Published
- 2025-02-06
- DOI
- https://doi.org/10.1007/s44214-025-00075-7
- Citations
- 6
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 3.11
Funders
- Ministry of Education, Culture, Sports, Science and Technology
- National Natural Science Foundation of China
- Research Grants Council, University Grants Committee
- Japan Society for the Promotion of Science
- Key Technologies Research and Development Program