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Theory and Models of Bose Condensation of Exciton/Polariton in Organic Semiconductor Thin-films


Within the past 5 or so years, a number of experiments have revealed the condensation of polariton quasi-particles in quasi 2d inorganic quantum well cavities.  A polariton condensate forms when there is a sufficiently high density of exciations in a material sandwiched between two dielectric reflectors that spontaneous symmetry breaking occurs and the exciton gas condenses to form a superfluidic state.  This has opened the door to test a number of novel and fundimental theories ranging from the BEC to BCS cross over  to Hawking radiation from blackholes.  Loosely speaking, the condensation occurs when all the dipole oscillators in the system are driven by a common field mode and spontaneously beging to evolve synchroneously much like the effect of super-radiance.  Our work has focused upon the dynamics of condensate formation in organic semiconductor-based systems.  I will discuss both the equilibrium and non-equilibrium/steady state regimes using models based upon one and two dimensional arrays of organic chromophores.  Time permitting, I will discuss our work on linear arrays of quantum nanorods coupled by a common surface plasmon mode.