Strain control of hybridization between dark and localized excitons in a 2D semiconductor

Pablo Hernández López (), Sebastian Heeg (), Christoph Schattauer, Sviatoslav Kovalchuk, Abhijeet Kumar, Douglas J. Bock, Jan N. Kirchhof, Bianca Höfer, Kyrylo Greben, Denis Yagodkin, Lukas Linhart, Florian Libisch and Kirill I. Bolotin ()
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Pablo Hernández López: Humboldt-Universität zu Berlin, Institut für Physik and IRIS Adlershof
Sebastian Heeg: Humboldt-Universität zu Berlin, Institut für Physik and IRIS Adlershof
Christoph Schattauer: Technische Universität Wien
Sviatoslav Kovalchuk: Freie Universität Berlin, Department of Physics
Abhijeet Kumar: Freie Universität Berlin, Department of Physics
Douglas J. Bock: Freie Universität Berlin, Department of Physics
Jan N. Kirchhof: Freie Universität Berlin, Department of Physics
Bianca Höfer: Freie Universität Berlin, Department of Physics
Kyrylo Greben: Freie Universität Berlin, Department of Physics
Denis Yagodkin: Freie Universität Berlin, Department of Physics
Lukas Linhart: Technische Universität Wien
Florian Libisch: Technische Universität Wien
Kirill I. Bolotin: Freie Universität Berlin, Department of Physics

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

Abstract: Abstract Mechanical strain is a powerful tuning knob for excitons, Coulomb-bound electron–hole complexes dominating optical properties of two-dimensional semiconductors. While the strain response of bright free excitons is broadly understood, the behaviour of dark free excitons (long-lived excitations that generally do not couple to light due to spin and momentum conservation) or localized excitons related to defects remains mostly unexplored. Here, we study the strain behaviour of these fragile many-body states on pristine suspended WSe2 kept at cryogenic temperatures. We find that under the application of strain, dark and localized excitons in monolayer WSe2—a prototypical 2D semiconductor—are brought into energetic resonance, forming a new hybrid state that inherits the properties of the constituent species. The characteristics of the hybridized state, including an order-of-magnitude enhanced light/matter coupling, avoided-crossing energy shifts, and strain tunability of many-body interactions, are all supported by first-principles calculations. The hybridized excitons reported here may play a critical role in the operation of single quantum emitters based on WSe2. Furthermore, the techniques we developed may be used to fingerprint unidentified excitonic states.

Date: 2022
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DOI: 10.1038/s41467-022-35352-9

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