title: Parametric polariton amplification in semiconductor microcavities.
abstract: 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 blueshift, we observe a phase dependence of the amplification which is a signature of a coherent polariton wave mixing process.
authors.affiliation: Laboratoire Kastler Brossel, Université Paris 6, Ecole Normale Supérieure et CNRS, UPMC Case 74, 4 place Jussieu, 75252 Paris Cedex 05, France.
authors.forename: G
authors.initials: G
authors.lastname: Messin
authors.forename: J P
authors.initials: JP
authors.lastname: Karr
authors.forename: A
authors.initials: A
authors.lastname: Baas
authors.forename: G
authors.initials: G
authors.lastname: Khitrova
authors.forename: R
authors.initials: R
authors.lastname: Houdré
authors.forename: R P
authors.initials: RP
authors.lastname: Stanley
authors.forename: U
authors.initials: U
authors.lastname: Oesterle
authors.forename: E
authors.initials: E
authors.lastname: Giacobino