Room-temperature continuous-wave pumped exciton polariton condensation in a perovskite microcavity
arxiv(2023)
摘要
Microcavity exciton polaritons (polaritons) as part-light part-matter
quasiparticles, garner significant attention for non-equilibrium Bose-Einstein
condensation at elevated temperatures. Recently, halide perovskites have
emerged as promising room-temperature polaritonic platforms thanks to their
large exciton binding energies and superior optical properties. However,
currently, inducing room-temperature non-equilibrium polariton condensation in
perovskite microcavities requires optical pulsed excitations with high
excitation densities. Herein, we demonstrate continuous-wave optically pumped
polariton condensation with an exceptionally low threshold of 0.6 W cm-2 and a
narrow linewidth of 1 meV. Polariton condensation is unambiguously
demonstrated by characterizing the nonlinear behavior and coherence properties.
We also identify a microscopic mechanism involving the potential landscape in
the perovskite microcavity, where numerous discretized energy levels arising
from the hybridization of adjacent potential minima enhance the polariton
relaxation, facilitating polariton condensate formation. Our findings lay the
foundation for the next-generation energy-efficient polaritonic devices
operating at room temperature.
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