Strain fingerprinting of exciton valley character in 2D semiconductors

Abhijeet M. Kumar, Denis Yagodkin, Roberto Rosati, Douglas J. Bock, Christoph Schattauer, Sarah Tobisch, Joakim Hagel, Bianca Höfer, Jan N. Kirchhof, Pablo Hernández López, Kenneth Burfeindt, Sebastian Heeg, Cornelius Gahl, Florian Libisch, Ermin Malic and Kirill I. Bolotin ()
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Abhijeet M. Kumar: Freie Universität Berlin
Denis Yagodkin: Freie Universität Berlin
Roberto Rosati: Philipps-Universität Marburg
Douglas J. Bock: Freie Universität Berlin
Christoph Schattauer: TU Wien
Sarah Tobisch: TU Wien
Joakim Hagel: Chalmers University of Technology
Bianca Höfer: Freie Universität Berlin
Jan N. Kirchhof: Freie Universität Berlin
Pablo Hernández López: Humboldt-Universität Berlin
Kenneth Burfeindt: Freie Universität Berlin
Sebastian Heeg: Humboldt-Universität Berlin
Cornelius Gahl: Freie Universität Berlin
Florian Libisch: TU Wien
Ermin Malic: Philipps-Universität Marburg
Kirill I. Bolotin: Freie Universität Berlin

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Intervalley excitons with electron and hole wavefunctions residing in different valleys determine the long-range transport and dynamics observed in many semiconductors. However, these excitons with vanishing oscillator strength do not directly couple to light and, hence, remain largely unstudied. Here, we develop a simple nanomechanical technique to control the energy hierarchy of valleys via their contrasting response to mechanical strain. We use our technique to discover previously inaccessible intervalley excitons associated with K, Γ, or Q valleys in prototypical 2D semiconductors WSe2 and WS2. We also demonstrate a new brightening mechanism, rendering an otherwise “dark” intervalley exciton visible via strain-controlled hybridization with an intravalley exciton. Moreover, we classify various localized excitons from their distinct strain response and achieve large tuning of their energy. Overall, our valley engineering approach establishes a new way to identify intervalley excitons and control their interactions in a diverse class of 2D systems.

Date: 2024
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DOI: 10.1038/s41467-024-51195-y

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