Polariton condensation with localised excitons and propagating photons
arXiv:cond-mat/0407076 · doi:10.1103/PhysRevLett.93.226403
Abstract
We estimate the condensation temperature for microcavity polaritons, allowing for their internal structure. We consider polaritons formed from localised excitons in a planar microcavity, using a generalised Dicke model. At low densities, we find a condensation temperature T_c \propto ρ, 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 B.C.S.-like mean field theory. We also calculate the excitation spectrum, which is related to observable quantities such as the luminescence and absorption spectra.
arXiv comment5 pages, 4 figures, Corrected typos, replaced figure 3
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