Observation of multiple vortex-antivortex pairs in perovskite based microcavity

Abstract

Exciton-polaritons are bosonic quasiparticles arising from strong light–matter coupling, capable of undergoing room-temperature Bose–Einstein condensation (BEC). Their vortex textures, which carry orbital angular momentum, hold great promise for advancing quantum and topological photonics. Here, we fabricate a 7 μm-diameter CsPbBr3 perovskite disk microcavity to spatially confine exciton-polaritons. Under femtosecond optical excitation at ambient temperature, polariton BEC is achieved and four distinct vortex cores are directly resolved via real-space imaging. These vortices form two coupled vortex–antivortex pairs, constituting a stable vortex-quadrupole topological state. Interferometric characterization identifies alternating topological charges (−1,+1,−1,+1) arranged with fourfold symmetry inside the microdisk. This work establishes a facile room-temperature experimental platform for exploring polariton vortex dynamics and for implementing reconfigurable topological photonic devices.