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; FluctuationsDOI: 10.1103/PhysRevB.72.125335Citations: 84data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-20References taken from IsiWeb of Knowledge: (subscribers only)