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説明:

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 .

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Moiré excitons, interlayer excitons, temperature dependence

刊行年月日: 2024-02-05

出版者: Springer Science and Business Media LLC

掲載誌:

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

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

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

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更新時刻: 2025-02-10 12:30:19 +0900

MDRでの公開時刻: 2025-02-10 12:30:21 +0900