Polaritons are quasiparticles formed by entanglement of a photon with an excitation of a molecule or atom. Recent experimental work on inorganic microcavities has shown that these quasiparticles can undergo a phase transition to form a Bose–Einstein condensate with a transition temperature approaching room temperature. This Demonstration computes the polariton dispersion curve for a layer of anthracene sandwiched between two reflecting mirrors. The cavity gap, , determines the cutoff frequency for a photon in the cavity and is the photon wavevector parallel to the mirrors. Computed are the effective mass of a lower polariton and the nonlinearity parameter for the Gross–Pitaevskii equation describing a polariton condensate state.
This Demonstration is based upon work sponsored by the National Science Foundation (CHE1011894). [1] D. G. Lidzey, D. D. C. Bradley, M. S. Skolnick, T. Virgili, S. Walker, and D. M. Whittaker. "Strong ExcitonPhoton Coupling in an Organic Semiconductor Microcavity," Nature, 395, 1998 pp. 53–55. [2] J. Kasprzak, M. Richard, S. Kundermann, A. Baas, P. Jeambriun, J. M. J. Keeling, F. M. Marchetti, M. H. Szymanska, R. André, J. L. Staehli, V. Savona, P. B. Littlewood, B. Deveaud, and L. S. Dang. "Bose–Einstein Condensation of Exciton Polaritons," Nature, 443, 2006 pp. 409–414. [3] P. B. Littlewood, J. M. J. Keeling, B. D. Simons, P. R. Eastham, F. M. Marchetti, and M. H. Szymańska. "Novel Quantum Condensates in Excitonic Matter ," in Lectures on the Physics of Strongly Correlated Systems (A. Avella and F. Mancini, Eds.), Vol. 1162, AIP, 2009 pp. 15–54.
