Optical spin Hall effect of polariton condensation in organic crystal microcavities

Optical spin Hall effect (OSHE), as a typical phenomenon of the coupling of spin and orbit degrees of freedom of photons during transmission in a medium, which has significant applications in novel spin photon devices and information transmission. However, the OSHE is weak in inorganic semiconductor microcavities and usually requires an external magnetic field, which limits its practical applications. In this work, we demonstrate the OSHE of polariton condensation in organic crystal microcavities without external magnetic field. The significant separation of left- and right-handed (σ^+/σ^-) circularly polarized of polariton condensation is observed in the two-dimensional (2D) momentum space and real space, which is the most notable feature of OSHE. Additionally, by adjusting the incident wavevector of the non-resonant excitation pump, the individual σ^+ or σ^- circularly polarized of polariton condensation can emerge in 2D momentum space and real space. The OSHE based on polariton condensation in organic crystal microcavities without external magnetic field has opened up new roads for polariton spintronics and topological photonics devices.