Phase diagram of microcavity exciton-polariton condensates

In this work, we study the exciton-polariton condensate phase transition in a microcavity matter-light system in which electron-hole Coulomb interaction and matter-light coupling effects are treated on an equal footing. In the framework of the unrestricted Hartree-Fock approximation applying the two...

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Bibliographic Details
Published in:Europhysics letters 2016-12, Vol.116 (5), p.57004-57004
Main Authors: Bui, Dinh-Hoi, Phan, Van-Nham
Format: Article
Language:English
Subjects:
67.85.Hj
71.10.Li
71.36.+c
Condensates
Coulomb friction
Coupling
Crossovers
Density
Electrons
Excitation
Excitons
Free electrons
Hartree approximation
Holes (electron deficiencies)
Low temperature
Mathematical analysis
Microcavities
Order parameters
Phase diagrams
Phase transitions
Photoluminescence
Photonics
Polaritons
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Summary:In this work, we study the exciton-polariton condensate phase transition in a microcavity matter-light system in which electron-hole Coulomb interaction and matter-light coupling effects are treated on an equal footing. In the framework of the unrestricted Hartree-Fock approximation applying the two-dimensional exciton-polariton model, we derive the self-consistent equations determining simultaneously the excitonic and the photonic condenstate order parameters. In the thermal-equilibrium limit, we find a condensed state of the exciton-polariton systems and phase diagrams are then constructed. At a given low temperature, the condensate by its nature shows a crossover from an excitonic to a polaritonic and finally photonic condensed state as the excitation density increases at large detuning. Without the detuning, the excitonic condensed state disappears whereas the polaritonic or photonic phases dominate. The crossover is also found by lowering the Coulomb interaction at a finite matter-light coupling. Lowering the Coulomb interaction or increasing the temperature, the excitonic Mott transition occurs, at which the exciton-polariton condensates dissociate to free electron-hole/photon. Depending on temperature and excitation density, the phase transition of the exciton-polariton condensates is also addressed in signatures of photoluminescence mapping to the photonic momentum distribution.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/116/57004