Spontaneous microcavity-polariton coherence across the parametric threshold: Quantum Monte Carlo studies

Year: 2005

Authors: Carusotto I., Ciuti C.

Autors Affiliation: Univ Trent, INFM, BEC, I-38050 Trento, Italy; Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; Ecole Normale Super, Lab Pierre Aigrain, F-75231 Paris, France.

Abstract: We investigate the appearance of spontaneous coherence in the parametric emission from planar semiconductor microcavities in the strong coupling regime. Calculations are performed by means of a quantum Monte Carlo technique based on the Wigner representation of the coupled exciton and cavity-photon fields. The numerical results are interpreted in terms of a nonequilibrium phase transition occurring at the parametric oscillation threshold: below the threshold, the signal emission is incoherent, and both the first and the second-order coherence functions have a finite correlation length which becomes macroscopic as the threshold is approached. Above the threshold, the emission is instead phase coherent over the whole two-dimensional sample and intensity fluctuations are suppressed. Similar calculations for quasi-one-dimensional microcavities show that in this case the phase coherence of the signal emission has a finite extension even above the threshold, while intensity fluctuations are suppressed.

Journal/Review: PHYSICAL REVIEW B

Volume: 72 (12)      Pages from: 125335-1  to: 125335-13

KeyWords: Bose-einstein Condensation; Exciton-exciton Scattering; Semiconductor Microcavity; Stimulated Scattering; Fluctuations
DOI: 10.1103/PhysRevB.72.125335

ImpactFactor: 3.185
Citations: 84
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