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2025
Journal Article
Title
Tunable Room-Temperature Polaritons in the Very Strong Coupling Regime in Quasi-2D Ruddlesden-Popper Perovskites
Abstract
Layered perovskites are an emergent class of materials, which feature extraordinarily large light–matter coupling, driven by excitons with binding energies significantly beyond the thermal energy at room-temperature. In this work, widely tunable room-temperature cavity exciton polaritons are demonstrated at the cross-over from the strong coupling to the very strong coupling regime in mechanically exfoliated crystals of quasi-2D Ruddlesden–Popper iodide perovskite (BA)2(MA)2Pb3I10 embedded in an open microcavity. The coupled exciton-cavity system features a Rabi-splitting up to ΩR ≃155 meV, exceeding the experimentally determined exciton binding energy of Eb = 100 ± 10 meV and thus operates at the onset of the very strong coupling regime, in which the light–matter coupling alters the interaction of electron and hole. This combined experimental-theoretical effort provides a consistent microscopic picture successfully describing the observed peculiar scaling of the Rabi-splitting with an increasing effective cavity length. These findings provide a foundation for future on-chip applications involving tunable polaritonic and nonlinear optical devices based on strongly coupled perovskite systems.
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Rights
CC BY 4.0: Creative Commons Attribution
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Language
English