Coherent interaction of WS$_2$ and quasi-2D perovskite excitons over micrometer distances via a cavity field
Year: 2026
Type: preprint
Abstract: The coherent coupling of cavity-confined photons and excitonic matter resonances leads to the formation of cavity polaritons, hybrid light-matter quasi-particles. If multiple exciton resonances couple to the same photonic mode, the resulting polariton constitutes a coherent interaction between matter resonances that can be spatially separated without any direct electronic coupling. In this work, we demonstrate the formation of such a coherent coupling at room temperature using an open optical cavity containing two distinct van der Waals materials - monolayer WS2 and layered quasi-2D halide perovskites (HaPs) - separated by $1.5 μ\rm m$. The system forms three polariton branches, with the middle branch possessing nearly equal fractions of both excitons and the photonic mode. White-light reflectivity and luminescence measurements are in good agreement with simulations using a coupled harmonic oscillator and a microscopic Wannier-Hopfield framework. Our results lay the foundation to combine highly complementary degrees of freedom in 2D materials in an in-situ tunable fashion to enable new polaritonic functionalities.
Source: arXiv (Cornell University)
Authors: Struve, Marti, Adl, Hamid Pashaei, Fitzgerald, Jamie M., Janikowska, Oliwia, Śmiertka, Maciej, Surrente, Alessandro, Stephan, Sven, Lienau, Christoph, Eilenberger, Falk, Sofer, Zdeněk, Paritmongkol, Watcharaphol, Tisdale, William A., Plochocka, Paulina, Malic, Ermin, Schneider, Christian, Esmann, Martin
Institutions: Carl von Ossietzky Universität Oldenburg, Philipps University of Marburg, Wrocław University of Science and Technology, University of Applied Sciences Emden Leer, Fraunhofer Institute for Applied Optics and Precision Engineering, University of Chemistry and Technology, Prague, Vidyasirimedhi Institute of Science and Technology, Massachusetts Institute of Technology, Centre National de la Recherche Scientifique, Laboratoire National des Champs Magnétiques Intenses
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G106018857, Next Generation of 2D Monoelemental Materials, Mikroskopisches Verständnis vom PhononBottleneck in 2D Perovskiten, G1798349569, G1935710221, G3596211750, G3810236772, G4396925471, G569086322, G5769488734, Optik, Dynamik und Transport von ExzitonPolaritonen in atomar dünnen Halbleitern, G8140083606
OpenAlex ID: W7208732840