Bose condensation of cavity polaritons beyond the linear regime: The thermal equilibrium of a model microcavity
Citation:
Eastham, PR, Littlewood, PB, Bose condensation of cavity polaritons beyond the linear regime: The thermal equilibrium of a model microcavity, Physical Review B, 64, 23, 2001, 235101-Download Item:
Abstract:
We consider a generalization of the Dicke model. This model describes localized, physically separated,
saturable excitations, such as excitons bound on impurities, coupled to a single long-lived mode of an optical
cavity. We consider the thermal equilibrium of this model at a fixed total number of excitons and photons. We
find a phase in which both the cavity field and the excitonic polarization are coherent. This phase corresponds
to a Bose condensate of cavity polaritons, generalized to allow for the fermionic internal structure of the
excitons. It is separated from the normal state by an unusual reentrant phase boundary. We calculate the
excitation energies of the model, and hence the optical absorption spectra of the cavity. In the condensed phase
the absorption spectrum is gapped. The presence of this gap distinguishes the polariton condensate from the
normal state and from a conventional laser, even when the inhomogeneous linewidth of the excitons is so large
that there is no observable polariton splitting in the normal state.
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http://people.tcd.ie/easthampDescription:
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Author: EASTHAM, PAUL
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Journal ArticleCollections
Series/Report no:
Physical Review B64
23
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Full text availableKeywords:
Condensed matter physics, excitonMetadata
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