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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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: twist angle, Moiré superlattice, interlayer excitons

Date published: 2023-07-01

Publisher: IOP Publishing

Journal:

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

Funding:

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

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

MDR DOI:

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

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Updated at: 2025-02-14 12:30:24 +0900

Published on MDR: 2025-02-14 12:30:26 +0900