Keldysh field theory for nonequilibrium condensation in a parametrically pumped polariton system
Keldysh field theory for nonequilibrium condensation in a parametrically pumped polariton system
We develop a quantum field theory for parametrically pumped polaritons using Keldysh Green's function techniques with which the occupations of the excitation spectra can be calculated. By considering the mean field and Gaussian fluctuations, we find that the highly nonequilibrium phase transition to the optical parametric oscillator regime is in …