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Interactions between out-of-plane dipoles in bosonic gases enable the long-range propagation of excitons. The lack of direct control over collective dipolar properties has hitherto limited the degrees of tunability and the microscopic understanding of exciton transport. In this work, we modulate the layer hybridization and interplay between many-body interactions of excitons in a van der Waals heterostructure with an applied vertical electric field. By performing spatiotemporally resolved measurements supported by microscopic theory, we uncover the dipole-dependent properties and transport of excitons with different degrees of hybridization. Moreover, we find constant emission quantum yields of the transporting species as a function of excitation power with dominating radiative decay mechanisms over nonradiative ones, a fundamental requirement for efficient excitonic devices. Our findings provide a complete picture of the many-body effects in the transport of dilute exciton gases and have crucial implications for the study of emerging states of matter, such as Bose-Einstein condensation, as well as for optoelectronic applications based on exciton propagation.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Dipoles, excitons, van der Waals heterostructure

刊行年月日: 2023-04-20

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Photonics (ISSN: 17494893) vol. 17 issue. 7 p. 615-621

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/s41566-023-01198-w

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更新時刻: 2025-02-23 22:46:01 +0900

MDRでの公開時刻: 2025-02-23 22:46:01 +0900