Photon emission as a source of coherent behaviour of polaritons
  We show that the combined effect of photon emission and Coulomb interactions may drive an exciton-polariton system towards a dynamical coherent state, even without phonon thermalization or any other relaxation mechanism. Exact diagonalization results for a finite system (a multilevel quantum dot interacting with the lowest energy photon mode of a microcavity) are presented in support to this statement. 
Herbert Vinck-Posada (1), Boris A. Rodriguez (1), P.S.S. Guimaraes   (2), Alejandro Cabo (3) and Augusto Gonzalez (3) ((1) U...