Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 76: Nanophotonics II
Q 76.6: Vortrag
Freitag, 14. März 2025, 15:45–16:00, WP-HS
Long-Range Self-Hybridized Exciton-Polaritons in Two-Dimensional Ruddlesden-Popper Perovskites — •Maximilian Black1, Mehdi Asadi2, Parsa Darman2, Sezer Seçkin3, Finja Schillmöller1, Tobias A. F. König3, Sara Darbari1,2, and Nahid Talebi1 — 1Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — 2Nano-Sensors and Detectors Lab., Tarbiat Modares University, Tehran, Iran — 3Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
Ruddlesden-Popper perovskites combine excellent photoluminescence efficiency and high synthetic versatility with a crystal structure of stacked quantum wells that induces two-dimensional quantum confinement in the bulk crystal. This makes them exciting platforms for the study of exciton-polaritons, mixed states of excitons and localized photons. In this work, we present proof of long-range propagating exciton-polaritons in the cavity formed by the crystal itself, a phenomenon called self-hybridization. Bright-field spectroscopy reveals excitonic splitting and polaritonic bending of Fabry-Pérot mode dispersion, while photoluminescence spectroscopy shows multiple thickness-dependent polariton branches. Strikingly, local optical excitation below the exciton energy couples light directly to in-plane polaritonic modes, which transfer energy to lower-energy polaritons. The exciton-polaritons exhibit directed long-range propagation, as confirmed by FDTD simulations. Thus, we demonstrate that mesoscopic 2D Ruddlesden-Popper perovskite flakes serve as an effective system for exploring exciton-polaritons at room temperature.
Keywords: Exciton-Polaritons; Perovskites; Polaritons; Strong Coupling; Self-Hybridized