Strong and Localized Luminescence from Interface Bubbles Between Stacked hBN Multilayers

Hae Yeon Lee, Soumya Sarkar, Kate Reidy, Abinash Kumar, Julian Klein, Kenji Watanabe, Takashi Taniguchi, James M. LeBeau, Frances M. Ross and Silvija Gradečak ()
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Hae Yeon Lee: Massachusetts Institute of Technology
Soumya Sarkar: National University of Singapore
Kate Reidy: Massachusetts Institute of Technology
Abinash Kumar: Massachusetts Institute of Technology
Julian Klein: Massachusetts Institute of Technology
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
James M. LeBeau: Massachusetts Institute of Technology
Frances M. Ross: Massachusetts Institute of Technology
Silvija Gradečak: Massachusetts Institute of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Extraordinary optoelectronic properties of van der Waals (vdW) heterostructures can be tuned via strain caused by mechanical deformation. Here, we demonstrate strong and localized luminescence in the ultraviolet region from interface bubbles between stacked multilayers of hexagonal boron nitride (hBN). Compared to bubbles in stacked monolayers, bubbles formed by stacking vdW multilayers show distinct mechanical behavior. We use this behavior to elucidate radius- and thickness-dependent bubble geometry and the resulting strain across the bubble, from which we establish the thickness-dependent bending rigidity of hBN multilayers. We then utilize the polymeric material confined within the bubbles to modify the bubble geometry under electron beam irradiation, resulting in strong luminescence and formation of optical standing waves. Our results open a route to design and modulate microscopic-scale optical cavities via strain engineering in vdW materials, which we suggest will be relevant to both fundamental mechanical studies and optoelectronic applications.

Date: 2022
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DOI: 10.1038/s41467-022-32708-z

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