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Moiré potential formed by stacking two monolayer semiconducting transition metal dichalcogenides with slightly lattice mismatch can act as periodic quantum confinement for optically generated exciton, generating spatially ordered zero-dimensional quantum system. However, broad emission spectrum arising from inhomogeneity among moiré potential hinders the exploration of the intrinsic properties of moiré exciton and its application for quantum optics. In this study, we have demonstrated a new method to realize the optical observation of quantum coherence and interference of a single moiré exciton in twisted monolayer semiconducting heterobilayer beyond the diffraction limit of light. A significant single and sharp photoluminescence peak from a single moiré exciton has been successfully demonstrated due to the restriction of optical excitation and detection of moiré potentials by applying the nano-fabrication to the heterobilayer. We present that the decoherence of a single moiré exciton has been accelerated with elevating temperature and excitation power density, which is determined by scattering process of moiré exciton and acoustic phonons, and between moiré excitons. The longer duration of quantum coherence of a single moiré exciton, reaching more than 10 ps, has been measured by the interferogram of emission signal at low temperature of 4 K, which is much longer than that of the exciton in a monolayer semiconductor. Moreover, the significant quantum interference has revealed the coupling between moiré excitons trapped in different moiré potential minima. The longer quantum coherence and interference of moiré exciton demonstrated in this study will provide the potential application toward quantum technologies based on moiré quantum systems.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Moiré potential, quantum coherence, twisted semiconducting heterobilayer

Date published: 2024-06-08

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 4905

Funding:

• MEXT | Japan Society for the Promotion of Science JP21H05233
• MEXT | Japan Society for the Promotion of Science JP16H00910
• MEXT | Japan Society for the Promotion of Science JP16H06331
• MEXT | Japan Society for the Promotion of Science JP19K22142
• MEXT | Japan Society for the Promotion of Science JP20H05664
• MEXT | Japan Society for the Promotion of Science JP21H05232
• MEXT | Japan Society for the Promotion of Science JP21H05235
• MEXT | Japan Society for the Promotion of Science JP22K18986
• MEXT | Japan Society for the Promotion of Science A3 Foresight Program
• MEXT | Japan Society for the Promotion of Science JP17H06786
• MEXT | Japan Society for the Promotion of Science JP19K14633
• MEXT | Japan Society for the Promotion of Science JP21H01012
• MEXT | Japan Society for the Promotion of Science JP20H00354
• MEXT | Japan Society for the Promotion of Science JP20H00354
• MEXT | Japan Science and Technology Agency JPMJFR213K
• Ministry of Education, Culture, Sports, Science and Technology K-CONNEX
• Ministry of Education, Culture, Sports, Science and Technology JPMXP0112101001
• Collaboration Program of the Laboratory for Complex Energy Processes, Institute of Advanced Energy, Kyoto University

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

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-024-48623-4

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Updated at: 2025-02-27 12:30:16 +0900

Published on MDR: 2025-02-27 12:30:16 +0900