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

Shan, Hangyong; Iorsh, Ivan; Han, Bo; Rupprecht, Christoph; Knopf, Heiko; Eilenberger, Falk; Esmann, Martin; Yumigeta, Kentaro; Watanabe, Kenji; Taniguchi, Takashi; Klembt, Sebastian; Höfling, Sven; Tongay, Sefaattin; Antón-Solanas, Carlos; Shelykh, Ivan A.; Schneider, Christian

doi:10.1038/s41467-022-30645-5

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

Journal Article · Mon May 30 00:00:00 EDT 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-30645-5· OSTI ID:1904281

^[1]; Iorsh, Ivan ^[2]; Han, Bo ^[3]; Rupprecht, Christoph ^[4]; Knopf, Heiko ^[5]; ^[5]; ^[3]; Yumigeta, Kentaro ^[6]; ^[7]; ^[7]; Klembt, Sebastian ^[4]; Höfling, Sven ^[4]; ^[6]; ^[3]; Shelykh, Ivan A. ^[8]; ^[3]

Carl von Ossietzky Univ., Oldenburg (Germany); OSTI
ITMO University (Russia)
Carl von Ossietzky Univ., Oldenburg (Germany)
Univ. of Wurzburg (Germany)
Friedrich Schiller Univ., Jena (Germany); Fraunhofer Institute for Applied Optics and Precision Engineering, Jena (Germany); Max Planck School of Photonics, Jena (Germany)
Arizona State Univ., Tempe, AZ (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)
ITMO University (Russia); University of Iceland (Iceland)

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.

View Accepted Manuscript (DOE)

Research Organization:: Arizona State University, Tempe, AZ (United States)

Sponsoring Organization:: European Research Council (ERC); Federal Ministry of Education and Science of Germany; German Research Foundation (DFG); Japan Society for the Promotion of Science (JSPS KAKENHI); Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; Ministry of Science and Higher Education of Russian Federation; National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0020653

OSTI ID:: 1904281

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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