Condensation of Cavity Polaritons in a Disordered Environment

Abstract

A model for direct two band excitons in a disordered quantum well coupled to light in a cavity is investigated. In the limit in which the exciton density is high, we assess the impact of weak `pair-breaking' disorder on the feasibility of condensation of cavity polaritons. The mean-field phase diagram shows a `lower density' region, where the condensate is dominated by electronic excitations and where disorder tends to close the condensate and quench coherence. Increasing the density of excitations in the system, partially due to the screening of Coulomb interaction, the excitations contributing to the condensate become mainly photon-like and coherence is reestablished for any value of disorder. In contrast, in the photon dominated region of the phase diagram, the energy gap of the quasi-particle spectrum still closes when the disorder strength is increased. Above mean-field, thermal, quantum and fluctuations induced by disorder are considered and the spectrum of the collective excitations is evaluated. In particular, it is shown that the angle resolved photon intensity exhibits an abrupt change in its behaviour, going from the condensed to the non-condensed region.

arXiv comment17 pages, 9 eps figures; published version

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Cited by in corpus (8)

• Collective coherence in planar semiconductor microcavities
• BCS-BEC crossover in a system of microcavity polaritons
• What Determines the Wave Function of Electron-Hole Pairs in Polariton Condensates?
• Absorption, Photoluminescence and Resonant Rayleigh Scattering Probes of Condensed Microcavity Polaritons
• Condensation and Lasing of Microcavity Polaritons: Comparison between two Models
• Keldysh Green's function approach to coherence in a non-equilibrium steady state: connecting Bose-Einstein condensation and lasing
• The new physics of non-equilibrium condensates: insights from classical dynamics
• Phase diagram of microcavity exciton-polariton condensates