title: Crossover from normal to anomalous diffusion in systems of field-aligned dipolar particles.
abstract: Using molecular dynamics simulations we investigate the translational dynamics of particles with dipolar interactions in homogenous external fields. For a broad range of concentrations, we find that the anisotropic, yet normal diffusive behavior characterizing weakly coupled systems becomes anomalous both parallel and perpendicular to the field at sufficiently high dipolar coupling and field strength. After the ballistic regime, chain formation first yields cagelike motion in all directions, followed by transient, mixed diffusive-superdiffusive behavior resulting from cooperative motion of the chains. The enhanced dynamics disappears only at higher densities close to crystallization.
authors.affiliation: Institute of Theoretical Physics, Sekr EW 7-1, Technical University Berlin, Hardenbergstrasse 36, D-10623 Berlin, Germany.
authors.forename: Jelena
authors.initials: J
authors.lastname: Jordanovic
authors.forename: Sebastian
authors.initials: S
authors.lastname: Jäger
authors.forename: Sabine H L
authors.initials: SH
authors.lastname: Klapp