BCS-BEC crossover in a system of microcavity polaritons

Jonathan Mark James Keeling, P R Eastham, M H Szymanska, P B Littlewood

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

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-c behaves like that for point bosons. At higher densities, when T-c approaches the Rabi splitting, T-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.

Original languageEnglish
Pages (from-to)115320
Number of pages19
JournalPhysical Review. B, Condensed matter and materials physics
Volume72
Issue number11
DOIs
Publication statusPublished - Sept 2005

Keywords

  • SINGLE QUANTUM-DOT
  • SEMICONDUCTOR MICROCAVITY
  • BOSE-CONDENSATION
  • PHASE-TRANSITIONS
  • SUPERCONDUCTIVITY
  • PHOTOLUMINESCENCE
  • SPECTROSCOPY
  • EQUILIBRIUM
  • STIMULATION
  • EMISSION

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