Spin-Orbit Coupled Trapped Exciton-Polariton Condensates in Perovskite Microcavity

Lead halide perovskites exhibit superior properties compared to classical III-V semiconductor quantum wells for room-temperature polaritonic applications, particularly owing to the significant crystalline anisotropy. This anisotropy results in a sizeable split in condensate energy, which can profoundly influence polariton interactions and spin relaxation pathways. Besides, trapped exciton-polariton (TEP) exhibits a quantized energy landscape, which is essential for modulating polaritonic logical circuits. Herein, spin-orbit coupled TEP lasing is demonstrated in birefringent perovskite. Cascade condensate processes between orthogonally polarized polariton branches happen considering the dominance of reservoir exciton-polariton or polariton-polariton scattering within each stage. Such condensation adequately is verified via the input-output "S" curve, the narrowed linewidth, the energy blueshift, and the real space spatial coherence of the orthogonally polarized modes. This trapped anisotropic condensate holds great promise for room-temperature polaritonic and spintronics.