Dynamics of small perturbations against a stationary polariton distribution

TL;DR

This paper investigates how small disturbances decay in a pumped polariton system, revealing decay times from 30 to 5000 ps influenced by pumping methods, with no singular behavior at lasing threshold.

Contribution

It provides a detailed analysis of decay dynamics in polariton systems, highlighting the impact of pumping schemes on decay times and the absence of singularities at lasing threshold.

Findings

Decay times range from 30 to 5000 ps depending on pumping

Resonant pumping causes large decay times due to a bottleneck effect

No singular behavior observed at the polariton lasing threshold

Abstract

The dynamics of small perturbations against the stationary density matrix of a pumped polariton system with only one photon polarization is studied. Depending on the way the system is pumped and probed, decay times ranging from 30 to 5000 ps are found. The large decay times under resonant pumping are related to a bottleneck effect in the decay of the excess (probe) populations of dark polariton states. No singular behaviour at the threshold for polariton lasing is observed.