Brightening of a dark monolayer semiconductor via strong light-matter coupling in a cavity

Hangyong Shan, Ivan Iorsh, Bo Han, Christoph Rupprecht, Heiko Knopf, Falk Eilenberger, Martin Esmann, Kentaro Yumigeta, Kenji Watanabe, Takashi Taniguchi, Sebastian Klembt, Sven Höfling, Sefaattin Tongay, Carlos Antón-Solanas, Ivan A. Shelykh and Christian Schneider ()
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Hangyong Shan: Carl von Ossietzky University
Ivan Iorsh: ITMO University
Bo Han: Carl von Ossietzky University
Christoph Rupprecht: Universität Würzburg
Heiko Knopf: Friedrich Schiller University
Falk Eilenberger: Friedrich Schiller University
Martin Esmann: Carl von Ossietzky University
Kentaro Yumigeta: Arizona State University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Sebastian Klembt: Universität Würzburg
Sven Höfling: Universität Würzburg
Sefaattin Tongay: Arizona State University
Carlos Antón-Solanas: Carl von Ossietzky University
Ivan A. Shelykh: ITMO University
Christian Schneider: Carl von Ossietzky University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Engineering the properties of quantum materials via strong light-matter coupling is a compelling research direction with a multiplicity of modern applications. Those range from modifying charge transport in organic molecules, steering particle correlation and interactions, and even controlling chemical reactions. Here, we study the modification of the material properties via strong coupling and demonstrate an effective inversion of the excitonic band-ordering in a monolayer of WSe2 with spin-forbidden, optically dark ground state. In our experiments, we harness the strong light-matter coupling between cavity photon and the high energy, spin-allowed bright exciton, and thus creating two bright polaritonic modes in the optical bandgap with the lower polariton mode pushed below the WSe2 dark state. We demonstrate that in this regime the commonly observed luminescence quenching stemming from the fast relaxation to the dark ground state is prevented, which results in the brightening of this intrinsically dark material. We probe this effective brightening by temperature-dependent photoluminescence, and we find an excellent agreement with a theoretical model accounting for the inversion of the band ordering and phonon-assisted polariton relaxation.

Date: 2022
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DOI: 10.1038/s41467-022-30645-5

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