Selective Excitation of Exciton–Polariton Condensate Modes in an Annular Perovskite Microcavity

Exciton–polariton systems composed of a light–matter quasi-particle with a light effective mass easily realize Bose–Einstein condensation. In this work, we constructed an annular trap in a halide perovskite semiconductor microcavity and observed the spontaneous formation of symmetrical petal-shaped exciton–polariton condensation in the annular trap at room temperature. In our study, we found that the number of petals of the petal-shaped exciton–polariton condensates, which is decided by the orbital angular momentum, is dependent on the light intensity distribution. Therefore, the selective excitation of perovskite microcavity exciton–polariton condensates under all-optical control can be realized by adjusting the light intensity distribution. This could pave the way to room-temperature topological devices, optical cryptographical devices, and new quantum gyroscopes in the exciton–polariton system.