Polariton-mediated Raman scattering in microcavities: A Green’s function approach

Abstract

We present calculations of the intensity of polariton-mediated inelastic light scattering in semiconductor microcavities within a Green's function framework. In addition to reproducing the strong coupling of light and matter, this method also enables the inclusion of damping mechanisms in a consistent way. Our results show excellent agreement with recent Raman scattering experiments.

Microcavity exciton-polariton mediated Raman scattering: Experiments and theory

“…Parameter A is taken as 0.031, derived from the fit to Raman experiments in resonance with the UP on a similar II-VI cavity in the very strong coupling regime. 24 The line broadening of the non interacting cavity-photon is estimated by standard realistic reflectivity calculations 36,37 to be γ f ≃ 1 meV. The exciton line broadening γ e1 , γ e2 , and the 2s-1s ratio of the exciton-LO phonon interaction matrix elements given by α (assumed as a real number), together with the proportionality factor, are left as fitting parameters.…”

“…Bare life time broadening are obtained from a fitting procedure and the effects of the exciton lifetime in relation to the cavity-polariton lifetime are discussed. An important improvement to the previously presented theoretical approaches 23,24 to describe the experimental observations quantitatively is obtained in the present work by accounting also for the second type of experiment, which provides additional severe constrains to the unknown parameters of the theory.…”

“…It has been shown previously, 18,19,22,23,24 that the outgoing Raman cross section mediated by cavity polaritons can be calculated by first order perturbation theory as…”