Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-07-02
Phys. Rev. Lett. 93, 226403 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, Corrected typos, replaced figure 3
Scientific paper
10.1103/PhysRevLett.93.226403
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 \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 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.
Eastham Paul R.
Keeling Jonathan
Littlewood Peter B.
Szymanska Marzena H.
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