Justyna A. Cwik, Sahinur Reja, Peter B. Littlewood, Jonathan Keeling
We consider how the presence of strong exciton-phonon coupling can modify the nature of the transition to a condensed phase in systems of strongly coupled light and organic molecules, such as anthracene and J-aggregates. Considering a model of two-level systems coupled to light, with relatively strong coupling to phonons, we show that the phonon coupling may drive the condensation transition first order, and that re-entrant behavior vs temperature may arise. We also explain how phonon replicas of the polariton spectrum can exist below the chemical potential without macroscopic occupancy.
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http://arxiv.org/abs/1303.3720
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