title: Localization of coherent exciton transport in phase space.
abstract: We study numerically the dynamics of excitons on discrete rings in the presence of static disorder. Based on continuous-time quantum walks we compute the time evolution of the Wigner function (WF) both for pure diagonal (site) disorder, as well as for diagonal and off-diagonal (site and transfer) disorder. In both cases, large disorder leads to localization and destroys the characteristic phase space patterns of the WF found in the absence of disorder.
authors.affiliation: Theoretische Polymerphysik, Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Mülken
authors.forename: Veronika
authors.initials: V
authors.lastname: Bierbaum
authors.forename: Alexander
authors.initials: A
authors.lastname: Blumen