Room-temperature polariton condensate in a quasi-2D hybrid perovskite
- Marti Struve
- Christoph Bennenhei
- Hamid Pashaei Adl
- Kok Wee Song
- Hangyong Shan
- Nadiya Matukhno
- Jens-Christian Drawer
- Sven Stephan
- Falk Eilenberger
- Naga Prathibha Jasti
- David Cahen
- Oleksandr Kyriienko
- Christian Schneider
- Martin Esmann
2026-01-31
Quasi-2D halide perovskites are chemically synthesized realizations of quantum well stacks with giant exciton oscillator strengths, tunable emission spectra, and very large exciton binding energies. While these features render quasi-2D halide perovskites a promising platform for room-temperature polaritonics, bosonic condensation and polariton lasing in quasi-2D perovskites have so far remained elusive at ambient conditions. Here, we demonstrate room-temperature cavity exciton-polariton condensation in mechanically exfoliated crystals of the quasi-2D Ruddlesden-Popper iodide perovskite (BA) 2 (MA) 2 Pb 3 I 10 in an open optical microcavity. We observe a polariton condensation threshold of 0.41 µJ cm −2 per pulse and detect a strong non-linear response. Interferometric measurements confirm the spontaneous emergence of spatial coherence across the condensate with an associated first-order autocorrelation reaching 0.6 with 1 ps coherence time and an effective de Broglie wavelength of 13 µm. Our results lay the foundation for a new class of room-temperature polariton lasers based on quasi-2D halide perovskites with great potential for hetero-integration with other van-der-Waals materials and combination with photonic crystals or waveguides.