BCS-BEC crossover in a system of microcavity polaritons
- Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE (United Kingdom)
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 T{sub c} behaves like that for point bosons. At higher densities, when T{sub c} approaches the Rabi splitting, T{sub c} 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.
- OSTI ID:
- 20719533
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 72, Issue 11; Other Information: DOI: 10.1103/PhysRevB.72.115320; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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