title: Polariton condensation with localized excitons and propagating photons.
abstract: We estimate the condensation temperature for microcavity polaritons, allowing for their internal structure. We consider polaritons formed from localized excitons in a planar microcavity, using a generalized Dicke model. At low densities, we find a condensation temperature T(c) proportional, rho, as expected for a gas of structureless polaritons. However, as T(c) becomes of the order of the Rabi splitting, the structure of the polaritons becomes relevant, and the condensation temperature is that of a BCS-like mean-field theory. We also calculate the excitation spectrum, which is related to observable quantities such as the luminescence and absorption spectra.
authors.affiliation: Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Keeling
authors.forename: P R
authors.initials: PR
authors.lastname: Eastham
authors.forename: M H
authors.initials: MH
authors.lastname: Szymanska
authors.forename: P B
authors.initials: PB
authors.lastname: Littlewood