Observation of long-lived polariton states in semiconductor microcavities across the parametric threshold
Other Condensed Matter
2009-11-13 v1
Abstract
The excitation spectrum around the pump-only stationary state of a polariton optical parametric oscillator (OPO) in semiconductor microcavities is investigated by time-resolved photoluminescence. The response to a weak pulsed perturbation in the vicinity of the idler mode is directly related to the lifetime of the elementary excitations. A dramatic increase of the lifetime is observed for a pump intensity approaching and exceeding the OPO threshold. The observations can be explained in terms of a critical slowing down of the dynamics upon approaching the threshold and the following onset of the soft Goldstone mode.
Keywords
Cite
@article{arxiv.0807.3224,
title = {Observation of long-lived polariton states in semiconductor microcavities across the parametric threshold},
author = {D. Ballarini and D. Sanvitto and A. Amo and L. Vina and M. Wouters and I. Carusotto and A. Lemaitre and J. Bloch},
journal= {arXiv preprint arXiv:0807.3224},
year = {2009}
}