Exciton-polariton condensate in the van der Waals magnet CrSBr
The study demonstrated a coherent macroscopic quantum phase, or bosonic condensation of exciton-polaritons, in CrSBr embedded in a tunable cavity. This condensate exhibits new non-linearity driven by incoherent magnons, and its behavior is highly sensitive to magnetic order. The system shows attractive interactions in the antiferromagnetic (AFM) phase and repulsive interactions in the forced ferromagnetic (FM) phase.