We present novel experimental results demonstrating the coherence properties of the nonlinear emission from semiconductor microcavities in the strong coupling regime, recently interpreted by parametric polariton four-wave mixing. We use a geometry corresponding to degenerate four-wave mixing. In addition to the predicted threshold dependence of the emission on the pump power and spectral blue shift, we observe a phase dependence of the amplification which is a signature of a coherent polariton wave mixing process.
@article{arxiv.cond-mat/0701442,
title = {Parametric polariton amplification in semiconductor microcavities},
author = {Gaëtan Messin and Jean-Philippe Karr and Augustin Baas and Galina Khitrova and Romuald Houdré and Ross P. Stanley and Ursula Oesterle and Elisabeth Giacobino},
journal= {arXiv preprint arXiv:cond-mat/0701442},
year = {2017}
}