We consider here the thermodynamics and phase-diagram of exciton/polaritons formed in low-dimensionalorganic single-crystal microcavities. Using the Dicke model for a lattice of Frenkel excitons coupled to a common cavity mode, we explore the transition between  normal and condensate  regimes as depending upon the exciton band-width and temperature of the polariton gas.   We show that for one-dimensional conjugated polymers, the coexistence curve at low temperaturesshifts towards lower critical coupling strengths as the exciton band-width is increased.   We also consider the effect of orientational disorder in a two-dimensional polyacene slab on the formation of the polariton BEC.   Our results indicate thatwhile a small degree of orientational disorder will not have a profound effect on the critical exciton/photon coupling strength needed to produce the  transition from normal to BEC regimes, BEC will likely be suppressed in glassy or strongly disordered molecular films.  Time permitting also will discuss the effect of exciton/exciton scattering and the possible onset of a Mott insulating phase.

Excitations and thermodynamics of light/matter quantum condensates in organic thin-films

243rd National Meeting (2012)

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