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Evolution of Temporal Coherence in Confined Exciton-Polariton Condensates
Klaas, M.,Flayac, H.,Amthor, M.,Savenko, I. G.,Brodbeck, S.,Ala-Nissila, T.,Klembt, S.,Schneider, C.,Hö,fling, S. American Physical Society 2018 Physical Review Letters Vol.120 No.1
<P>We study the influence of spatial confinement on the second-order temporal coherence of the emission from a semiconductor mieroeavity in the strong coupling regime. The confinement, provided by etched micropillars, has a favorable impact on the temporal coherence of solid state quasicondensates that evolve in our device above threshold. By fitting the experimental data with a microscopic quantum theory based on a quantum jump approach, we scrutinize the influence of pump power and confinement and find that phonon-mediated transitions are enhanced in the case of a confined structure, in which the modes split into a discrete set. By increasing the pump power beyond the condensation threshold, temporal coherence significantly improves in devices with increased spatial confinement, as revealed in the transition from thermal to coherent statistics of the emitted light.</P>
Kinetic Monte Carlo approach to nonequilibrium bosonic systems
Liew, T. C. H.,Flayac, H.,Poletti, D.,Savenko, I. G.,Laussy, F. P. American Physical Society 2017 Physical Review B Vol.96 No.12
<P>We consider the use of a kinetic Monte Carlo approach for the description of nonequilibrium bosonic systems, taking nonresonantly excited exciton-polariton condensates and bosonic cascade lasers as examples. In the former case, the considered approach allows the study of the cross-over between incoherent and coherent regimes, which represents the formation of a quasicondensate that forms purely from the action of energy relaxation processes rather than interactions between the condensing particles themselves. In the latter case, we show theoretically that a bosonic cascade can develop an output coherent state.</P>