Room-temperature polariton supersolids
Researchers experimentally created a room-temperature polariton supersolid in organic-inorganic halide perovskites using a photonic crystal device. This macroscopic quantum state, where crystalline order and superfluid flow coexist, was achieved by driving parametric scattering in engineered polariton modes above specific pump fluences. This breakthrough opens a platform for studying quantum hydrodynamics at ambient conditions.