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BCS-BEC crossover in a system of microcavity polaritons
We investigate the thermodynamics and signatures of a polariton condensate over a range of densities, using a model of microcavity polaritons with internal structure. We determine a phase diagram for this system including fluctuation corrections to the mean-field theory. At low densities the condensation temperature Tc behaves like that for point bosons. At higher densities, when Tc approaches the Rabi splitting, Tc deviates from the form for point bosons, and instead approaches the result of a BCS-like mean-field theory. This crossover occurs at densities much less than the Mott density. We show that current experiments are in a density range where the phase boundary is described by the BCS-like mean-field boundary. We investigate the influence of inhomogeneous broadening and detuning of excitons on the phase diagram.
Keyword(s): Atomic, molecular and chemical physics; polariton
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Citation(s): Keeling, J, Eastham, PR, Szymanska, MH, Littlewood, PB, BCS-BEC crossover in a system of microcavity polaritons, Physical Review B, 72, 11, 2005, 115320
Publisher(s): American Physical Society
First Indexed: 2014-05-13 05:12:12 Last Updated: 2017-04-26 08:35:04