Volume 116, Number 5, December 2016
|Number of page(s)
|Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
|01 February 2017
Phase diagram of microcavity exciton-polariton condensates
1 Institute of Research and Development, Duy Tan University - 3 Quang Trung, Danang, Vietnam
2 Department of Physics, Hue University's College of Education - 34 Le Loi, Hue, Vietnam
Received: 5 July 2016
Accepted: 3 January 2017
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.
PACS: 71.10.Li – Excited states and pairing interactions in model systems / 71.36.+c – Polaritons (including photon-phonon and photon-magnon interactions) / 67.85.Hj – Bose-Einstein condensates in optical potentials
© EPLA, 2016
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