We present a comparative analysis of a 'conventional' phonoriton (coherent superposition of exciton-photon-phonon) and a polariton (coherent exciton-photon superposition) 'weakly' coupled to the LA-phonons bath. Depending on duration of the pumping laser field the phonon-induced decoherence results in two distinct types of excitation. Long (ms) laser pumping pulses form an 'equilibrium' polariton. The generic feature here is a pronounced photo-thermal bi-stability. i.e. formation of four distinct branches. Transitions between branches can be achieved by excitation energy fluctuations as small as 200neV which may impede BEC of the para-excitons. Short (μs) laser pulses create a 'quasi-equilibrium' polariton. In the latter case, for some critical intensity of the laser field we demonstrate possibility of strong luminicence from a highly unstable localized state on the lower polariton branch.
@article{arxiv.cond-mat/0703650,
title = {Polaritons in cuprous oxide perturbed by LA-phonons},
author = {Oleksiy Roslyak and Joseph L. Birman},
journal= {arXiv preprint arXiv:cond-mat/0703650},
year = {2007}
}