All-Optical Control of Rotational Exciton Polaritons Condensate in Perovskite Microcavities

Exciton polariton condensation is a macroscopic quantum state that can be efficiently controlled by an external field through a nonlinear interaction. In an annular potential landscape, a rotational polariton flow with different orbit indexes can be created spontaneously. Control of their superposition states with symmetry broken is of fundamental interest for exotic quantum states. By adopting the nonresonant ring-shaped pumping in a planar perovskite microcavity, we demonstrate the linear coupled counter-rotating polariton states with ordered phase changes and a vortex pairs-petal state at the condensed threshold. The azimuthal indices and inherent flowing velocity can be well controlled by the diameter of the pumping ring and the detuning energy. At high pump density, the petal state becomes unstable and a single vortex generates, indicating the role of the polariton–polariton interaction and exciton depletion in controlling the superposition of the rotational polariton flow. Broken cylindrical symmetry is realized by a pumping ring with radial slots and the consequent dark soliton. An additional phase jump and fractional orbit index of polariton rotation can thus be obtained. Our results suggest the efficient all-optical control of rotational polariton flow and their superposition states with a flexible diameter and a broken cylindrical symmetry at room temperature, which is promising for practical polaritonic circular current-based applications with topological and chiral properties.