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

Riya Sebait, Roberto Rosati, Seok Joon Yun, Krishna P. Dhakal, Samuel Brem, Chandan Biswas, Alexander Puretzky, Ermin Malic () and Young Hee Lee ()
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Riya Sebait: Sungkyunkwan University
Roberto Rosati: Philipps-Universität Marburg
Seok Joon Yun: Oak Ridge National Laboratory
Krishna P. Dhakal: Sungkyunkwan University
Samuel Brem: Philipps-Universität Marburg
Chandan Biswas: Sungkyunkwan University
Alexander Puretzky: Oak Ridge National Laboratory
Ermin Malic: Philipps-Universität Marburg
Young Hee Lee: Sungkyunkwan University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract 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.

Date: 2023
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DOI: 10.1038/s41467-023-41047-6

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