Revealing Dark Exciton Signatures in Polariton Spectra of 2D Materials
Artikel i vetenskaplig tidskrift, 2024
Dark excitons in transition metal dichalcogenides (TMDs) have been so far neglected in the context of polariton physics due to their lack of oscillator strength. However, in tungsten-based TMDs, dark excitons are known to be the energetically lowest states and could thus provide important scattering partners for polaritons. In this joint theoretical-experimental work, we investigate the impact of the full exciton energy landscape on polariton absorption and reflectance. By changing the cavity detuning, we vary the polariton energy relative to the unaffected dark excitons in such a way that we open or close specific phonon-driven scattering channels. We demonstrate both in theory and experiment that this controlled switching of scattering channels manifests in characteristic sharp changes in the optical spectra of polaritons. These spectral features can be exploited to extract the position of dark excitons. Our work suggests new possibilities for exploiting polaritons for fingerprinting nanomaterials via their unique exciton landscape.
strong coupling
cavity detuning
transition metal dichalcogenides
polaritonic absorption
polariton-dark exciton scattering
Författare
Beatriz de Amorim Ferreira
Chalmers, Fysik, Kondenserad materie- och materialteori
Hangyong Shan
Carl von Ossietzky Universität Oldenburg
Roberto Rosati
Philipps-Universität Marburg
Jamie M. Fitzgerald
Philipps-Universität Marburg
Lukas Lackner
Carl von Ossietzky Universität Oldenburg
Bo Han
Carl von Ossietzky Universität Oldenburg
Martin Esmann
Carl von Ossietzky Universität Oldenburg
Patrick Hays
Arizona State University
Gilbert Leibeling
Friedrich-Schiller-Universität Jena
Fraunhofer-Institut für Angewandte Optik und Feinmechanik in Jena
Max Planck School of Photonics
Kenji Watanabe
National Institute for Materials Science (NIMS)
Takashi Taniguchi
National Institute for Materials Science (NIMS)
Falk Eilenberger
Fraunhofer-Institut für Angewandte Optik und Feinmechanik in Jena
Max Planck School of Photonics
Friedrich-Schiller-Universität Jena
Sefaattin Tongay
Arizona State University
Christian Schneider
Carl von Ossietzky Universität Oldenburg
Ermin Malic
Philipps-Universität Marburg
ACS Photonics
2330-4022 (eISSN)
Vol. 11 6 2215-2220Plasmon-exciton coupling at the attosecond-subnanometer scale: Tailoring strong light-matter interactions at room temperature
Knut och Alice Wallenbergs Stiftelse (2019.0140), 2020-07-01 -- 2025-06-30.
Ämneskategorier
Atom- och molekylfysik och optik
Annan fysik
Den kondenserade materiens fysik
DOI
10.1021/acsphotonics.3c01795