title: Thermodynamics of exciton/polaritons in one and two dimensional organic single-crystal microcavities.
abstract: We consider here the thermodynamics and phase-diagram of exciton/polaritons formed in low-dimensional organic 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 temperatures shifts 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 that while 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.
authors.affiliation: Department of Chemistry, University of Houston, Houston, TX 77204, USA. bittner@uh.edu
authors.forename: Eric R
authors.initials: ER
authors.lastname: Bittner
authors.forename: Svitlana
authors.initials: S
authors.lastname: Zaster
authors.forename: Carlos
authors.initials: C
authors.lastname: Silva