title: Superballistic spreading of wave packets.
abstract: We demonstrate for various systems that the variance of a wave packet M(t) proportional to t(nu), can show a superballistic increase with 2 < nu < or = 3, for parametrically large time intervals. A model is constructed that explains this phenomenon and its predictions are verified numerically for various disordered and quasiperiodic systems.
authors.affiliation: Max-Planck-Institut für Strömungsforschung und Institut für Nichtlineare Dynamik der Universität Göttingen, Bunsenstrasse 10, 37073 Göttingen, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Hufnagel
authors.forename: R
authors.initials: R
authors.lastname: Ketzmerick
authors.forename: T
authors.initials: T
authors.lastname: Kottos
authors.forename: T
authors.initials: T
authors.lastname: Geisel