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The moir ́e superlattice has emerged as a powerful way to tune excitonic properties in two-dimensional van der Waals structures. However, the current understanding of the influence of the twist angle for interlayer excitons in heterostructures is mainly limited to momentum-direct K − K transitions. In this work we use a judicious combination of spectroscopy and many-particle theory to investigate the influence of the twist angle on momentum-indirect interlayer excitons of a MoSe2/MoS2 heterostructure. Here, the energetically lowest state is a dark and strongly hybridized ΓK exciton. We show that increasing the twist angle from an aligned structure (0◦ or 60◦) gives rise to a large blue shift of the interlayer exciton, which is a manifestation of the strong dehybridization of this state. Moreover, for small twist angle samples, our photoluminescence measurements reveal contributions from two interlayer exciton states, which our modellingattributestothetransitionsfromdifferentmoir ́e-minibands. Our finding contributes to a better fundamental understanding of the influence of the moir ́e pattern on the hybridization of dark interlayer exciton states, which may be important for applications in moir ́etronics including novel quantum technologies.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: twist angle, Moiré superlattice, interlayer excitons

刊行年月日: 2023-07-01

出版者: IOP Publishing

掲載誌:

• 2D Materials (ISSN: 20531583) vol. 10 issue. 3 034003

研究助成金:

• Narodowe Centrum Nauki 2020/38/E/ST3/00194
• Deutsche Forschungsgemeinschaft 504846924

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1088/2053-1583/acdbdb

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更新時刻: 2025-02-14 12:30:24 +0900

MDRでの公開時刻: 2025-02-14 12:30:26 +0900