Synchronized full vortices as topological spin-Meissner states in spinor exciton–polariton condensates

The spin-Meissner effect is a phenomenon in which the Zeeman energy splitting of a spinor exciton–polariton condensate in a magnetic field is suppressed. If a topological state shows this effect, the state is called the topological spin-Meissner (TSM) state. We found that a vortex state of a spinor MPC in which each spin component carries a phase singularity in a magnetic field could be a TSM state. The physical properties of a TSM state in full vortices are affected by nonlinear spin-anisotropic interactions among polaritons, spin-flipping rates, and Zeeman energy splitting. Bistable TSM states in full vortices exist, as the magnetic field strength is below a critical strength, which depends on the pump power. The distributions of the degrees of circular polarization of full vortices are also studied.