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 2215-2220

Plasmon-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

Mer information

Senast uppdaterat

2024-07-27