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Extraordinary optoelectronic properties of van der Waals (vdW) heterostructures can be tuned via strain by mechanical deformation. So far, out-of-plane deformation and the resulting modification of the optical properties have been explored in transition metal dichalcogenides (TMDs) monolayers in visible region. Here, we demonstrate strong and localized luminescence in ultraviolet region from bubbles buried inside vdW multilayers of hexagonal boron nitride (hBN). As bubbles formed by vdW multilayers show distinct mechanical behavior compared to the case of a monolayer, we develop a comprehensive understanding of the bubble geometry and the thickness-dependent bending rigidity in vdW multilayers by combining theory and experiment. Additionally, we utilize the material confined within the bubbles to modify the bubble geometry under the electron beam irradiation, which results in the strong luminescence. Our results open a new route to design and modulate microscopic-scale optical cavities via strain engineering, which is of interest for both fundamental mechanical studies and optoelectronic applications.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Van der Waals heterostructures, luminescence, strain engineering

Date published: 2022-08-25

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 13 issue. 1 5000

Funding:

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

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-022-32708-z

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Updated at: 2025-02-27 08:30:59 +0900

Published on MDR: 2025-02-27 08:30:59 +0900