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Microcavity exciton polaritons (polaritons) as part-light part-matterquasiparticles, garner significant attention for non-equilibrium Bose-Einsteincondensation at elevated temperatures. Recently, halide perovskites haveemerged as promising room-temperature polaritonic platforms thanks to theirlarge exciton binding energies and superior optical properties. However,currently, inducing room-temperature non-equilibrium polariton condensation inperovskite microcavities requires optical pulsed excitations with highexcitation densities. Herein, we demonstrate continuous-wave optically pumpedpolariton condensation with an exceptionally low threshold of ~0.6 W cm-2 and anarrow linewidth of ~1 meV. Polariton condensation is unambiguouslydemonstrated by characterizing the nonlinear behavior and coherence properties.We also identify a microscopic mechanism involving the potential landscape inthe perovskite microcavity, where numerous discretized energy levels arisingfrom the hybridization of adjacent potential minima enhance the polaritonrelaxation, facilitating polariton condensate formation. Our findings lay thefoundation for the next-generation energy-efficient polaritonic devicesoperating at room temperature.

Room-temperature continuous-wave pumped exciton polariton condensation in a perovskite microcavity