Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 54: 2D Materials IX – Photonic properties and devices
HL 54.10: Talk
Friday, March 13, 2026, 12:00–12:15, POT/0081
Tunable Room-Temperature Polaritons Achieving the Very Strong Coupling Regime in Quasi-2D Layered Perovskites — •Hamid Pashaei Adl1, C. Bennenhei1, M. Struve1, P. Peksa2, M. Dyksik2, M. Baranowski2, K. W. Song3, M. Gittinger1, C. Lienau1, J. K. König4, J. M. Fitzgerald4, N. P. Jasti5, F. Eilenberger6, P. Plochocka2, E. Malic4, O. Kyriienko7, M. Esmann1, and C. Schneider1 — 1Carl von Ossietzky Universität Oldenburg, Germany. — 2Wroclaw University of Science and Technology, Wroclaw, Poland. — 3Xiamen University Malaysia, Sepang, Malaysia. — 4Philipps-Universität, Marburg, Germany. — 5JNCASR, Bangalore, India. — 6Max Planck School of Photonics, Jena, Germany. — 7University of Sheffield, UK.
Layered halide perovskites are organic and inorganic 2D or quasi-2D layers, which self-assemble in solution realizations of quantum well stacks with giant exciton oscillator strengths, tunable emission spectra and very large exciton binding energies. In this contribution, we discuss widely tunable room-temperature cavity exciton polaritons at the cross-over from the strong coupling to the very strong coupling regime, in mechanically exfoliated quasi-2D Ruddlesden-Popper iodide perovskite integrated into an open microcavity. We gradually increased the cavity length and observed a pronounced anti-crossing behavior associated with successive longitudinal cavity modes. The Rabi splitting exhibited a systematic reduction with increasing cavity length; however, the scaling behavior deviated from the conventional square root dependence typically observed in the strong coupling regime.
Keywords: Quasi-2D Perovskites; Very Strong Coupling Regime; Room-Temperature Polaritons; Open Cavity