title: Propagation of quantum walks in electric fields.
abstract: We study one-dimensional quantum walks in a homogenous electric field. The field is given by a phase which depends linearly on position and is applied after each step. The long time propagation properties of this system, such as revivals, ballistic expansion, and Anderson localization, depend very sensitively on the value of the electric field, Φ, e.g., on whether Φ/(2π) is rational or irrational. We relate these properties to the continued fraction expansion of the field. When the field is given only with finite accuracy, the beginning of the expansion allows analogous conclusions about the behavior on finite time scales.
authors.affiliation: Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Cedzich
authors.forename: T
authors.initials: T
authors.lastname: Rybár
authors.forename: A H
authors.initials: AH
authors.lastname: Werner
authors.forename: A
authors.initials: A
authors.lastname: Alberti
authors.forename: M
authors.initials: M
authors.lastname: Genske
authors.forename: R F
authors.initials: RF
authors.lastname: Werner