Exciton-polaritons are light-matter quasiparticles in semiconductor microcavities. Above a pump threshold, they form a non-equilibrium Bose-Einstein condensate described by the driven-dissipative Gross-Pitaevskii equation.
Unlike equilibrium BEC, polariton condensates require continuous pumping to compensate cavity losses. Vortices and solitons emerge from the nonlinear GP dynamics.