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Sequential order dependent dark-exciton modulation in bi-layered TMD heterostructure

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Title
Sequential order dependent dark-exciton modulation in bi-layered TMD heterostructure
Author(s)
Riya Sebait; Rosati, Roberto; Yun, Seok Joon; Dhakal, Krishna P.; Brem, Samuel; Chandan Biswas; Puretzky, Alexander; Malic, Ermin; Young Hee Lee
Publication Date
2023-09
Journal
Nature Communications, v.14, no.1
Publisher
Nature Research
Abstract
© 2023 Springer Nature Limited. We report the emergence of dark-excitons in transition-metal-dichalcogenide (TMD) heterostructures that strongly rely on the stacking sequence, i.e., momentum-dark K-Q exciton located exclusively at the top layer of the heterostructure. The feature stems from band renormalization and is distinct from those of typical neutral excitons or trions, regardless of materials, substrates, and even homogeneous bilayers, which is further confirmed by scanning tunneling spectroscopy. To understand the unusual stacking sequence, we introduce the excitonic Elliot formula by imposing strain exclusively on the top layer that could be a consequence of the stacking process. We further find that the intensity ratio of Q- to K-excitons in the same layer is inversely proportional to laser power, unlike for conventional K-K excitons. This can be a metric for engineering the intensity of dark K-Q excitons in TMD heterostructures, which could be useful for optical power switches in solar panels. © 2023, Springer Nature Limited.
URI
https://pr.ibs.re.kr/handle/8788114/14020
DOI
10.1038/s41467-023-41047-6
ISSN
2041-1723
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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