title: Elastic scattering dynamics of cavity polaritons: evidence for time-energy uncertainty and polariton localization.
abstract: The directional dynamics of the resonant Rayleigh scattering from a semiconductor microcavity is investigated. When optically exciting the lower polariton branch, the strong dispersion results in a directional emission on a ring. The coherent emission ring shows a reduction of its angular width for increasing time after excitation, giving direct evidence for the time-energy uncertainty in the dynamics of the scattering by disorder. The ring width converges with time to a finite value, a direct measure of an intrinsic momentum broadening of the polariton states localized by multiple disorder scattering.
authors.affiliation: Experimentelle Physik EIIb, Universität Dortmund, Otto-Hahn-Strasse 4, D-44227 Dortmund, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Langbein
authors.forename: Jørn M
authors.initials: JM
authors.lastname: Hvam