Theory of vibronic assistance in the nonequilibrium condensation of   exciton polaritons in optically--pumped organic single crystal microcavities
  We present a reaction/diffusion model for the formation of a lower polariton condensate in a micro cavity containing an organic semiconducting molecular crystalline film. Our model--based upon an anthracene film sandwiched between two reflecting dielectric mirrors--consists of three coupled fields corresponding to a gas of excitons created by an external driving pulse, a reservoir of vibron states formed by the coupling between a ground-state vibrational model and a cavity photon, and a lower polariton condensate. We show that at finite temperature, the presence of the vibron reservoir can augment the exciton population such that a lower critical pumping threshold is required to achieve condensation. 
Eric R. Bittner and Svitlana Zaster and Carlos Silva
cond-mat.quant-gas quant-ph