Kinetic Monte Carlo approach to nonequilibrium bosonic systems

Abstract

We consider the use of a Kinetic Monte Carlo approach for the description of non-equilibrium bosonic systems, taking non-resonantly 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 quasi-condensate that forms purely from the action of energy relaxation processes rather than interactions between the condensing particles themselves. In the latter case, we show that a bosonic cascade can theoretically develop an output coherent state.

Terahertz cascades from nanoparticles

“…As our system essentially amounts to a gain medium, with population inversion, located in a cavity it could also be considered a THz laser. A coherent statistics would be expected of the emission [29], although we do not calculate it here, restricting ourselves to a semiclassical theory.…”

Study of parabolic quantum well microcavities and terahertz time domain spectroscopy in the bosonic cascade regime

“…However, studies of exciton dynamics showed that the radiative cascade wasn't the dominant relaxation mechanism [71,84]. A recent theoretical study tried to explain this suppression of the radiative transitions and proposed a new alternative scheme based on double QW structures [84]. Nevertheless, we showed that excitons relax much faster in the parabolic potential compared to a structure with conventional rectangular QWs.…”

“…This part was based on the proposal of a BCL [51]. However, studies of exciton dynamics showed that the radiative cascade wasn't the dominant relaxation mechanism [71,84]. A recent theoretical study tried to explain this suppression of the radiative transitions and proposed a new alternative scheme based on double QW structures [84].…”

“…The scientific community continues to study BCLs and propose new ways, structures, and systems capable of emitting THz radiation [50,52,71,84,86,87]. Technology is advancing and THz related components and setups are getting better, faster, and more reliable.…”

Cavity QED effects in low dimensional systems

“…The lower density of states and the consequently weaker energy relaxation processes needed higher quality factor microcavities to provide a longer lifetime to compensate and achieve polariton condensation [56]. Theoretical calculations show that in 1D, the inuence of polariton-phonon scattering is very small and that the condensation here is dominated by other factors such as polaritonexciton scattering [57].…”