Room Temperature Long-Range Coherent Exciton Polariton Condensate Propagation in Lead Halide Perovskites Microwire Cavity

Recent progress has shown that halide perovskites are promising optical gain materials towards room-temperature strong-light matter coupling leading to robust exciton polariton, due to large exciton binding energy and strong oscilator strength. Polariton condensates, exhibiting high speed coherent propagation and spin-based behaviour, attract considerable interest for implementing the basic elements of integrated optoelectronic devices: switching, transport, and logic. However, the implementation of such coherent polariton condensate flow is typically limited to cryogenic temperatures, constrained by small exciton binding energy in most semiconductor microcavities. Here, we demonstrate the capability of long-range non-resonantly excited polariton condensate flow at room temperature in a one-dimensional all-inorganic cesium lead bromide (CsPbBr₃) perovskite microwire microcavity. The polariton condensate exhibits high speed propagation over macroscopic distances of 60 µm, while still preserving the long-range off-diagonal order. Our findings pave the way for utilizing coherent polariton condensate flow for all-optical integrated logic circuits and polaritonic devices operating at room temperature.