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Moiré excitons (MXs) are electron-hole pairs localized by the periodic (moiré) potential forming when two two-dimensional crystals are stacked together in a heterostructure (HS). MXs exhibit intriguing properties that can be exploited e.g. for achieving strongly correlated electronic phases at relatively high temperatures or nanoscale ordered arrays of thermally stable single-photon emitters. Here, we studied the exciton properties of a WSe2/MoSe2 HS from T=6 K to room temperature using time-resolved and continuous-wave micro-photoluminescence also under magnetic field. The emission lineshape evolution with temperature and its dependence on the photogenerated carrier density show clear signatures that MXs de-trap from the moir ́e potential and turn into free interlayer excitons (IXs) at T ≳120 K. The MX-to-IX transition is also apparent from Zeeman splitting measurements showing that the exciton gyromagnetic factor changes dramatically, reversing its sign when the moir ́e potential is not capable to localize excitons at elevated temperatures. At the same time, the exciton formation and decay times reduce drastically with increasing T .

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• Creative Commons BY Attribution 4.0 International
  

Keyword: Moiré excitons, interlayer excitons, temperature dependence

Date published: 2024-02-05

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 1057

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

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-024-44739-9

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Updated at: 2025-02-10 12:30:19 +0900

Published on MDR: 2025-02-10 12:30:21 +0900