Loop parametric scattering of cavity polaritons

TL;DR

This paper predicts a giant loop scattering phenomenon in a 2D bosonic system under mean-field approximation, involving parametric decay and back scattering, leading to oscillations in polariton condensates within microcavities.

Contribution

It introduces a novel theoretical prediction of loop parametric scattering in cavity polaritons, highlighting hybridized scattering processes causing oscillations.

Findings

Predicted giant loop scattering in polariton systems.

Oscillations in condensate amplitude in the sub-THz range.

Hybridization of scattering processes leads to non-trivial dynamics.

Abstract

Within the framework of the mean-field approximation, a coherently excited two-dimensional system of weakly repulsive bosons is predicted to show a giant loop scattering when the rotational symmetry is reduced. The considered process combines (i) the parametric decay of the driven condensate into different k-states and (ii) their massive back scattering owing to spontaneous synchronization of several four-wave mixing channels. The hybridization of the direct and inverse scattering processes, which are different and thus do not balance each other, makes the condensate oscillate under constant one-mode excitation. In particular, the amplitude of a polariton condensate excited by a resonant electromagnetic wave in a uniform polygonal GaAs-based microcavity is expected to oscillate in the sub-THz frequency domain.