title: Consequences of anomalous diffusion in disordered systems under cyclic forcing.
abstract: We study the particle scale response of a 2D frictionless disk system to bulk forcing via cyclic shear with reversal amplitude γ_{r}. We find a subdiffusive γ_{r}-dependent regime, which is consistent with models of anomalous diffusion with scale-invariant cage dynamics, and a crossover to diffusive grain motion at high γ_{r}. Analysis of local displacements of a particle relative to its cage of neighbors reveals a key distinction from thermal systems. Particles are moved by fluctuations of their cage of neighbors rather than rattling in their cage, indicating a distinct cage-breaking mechanism.
authors.affiliation: Department of Physics, IREAP, and IPST, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Mitch
authors.initials: M
authors.lastname: Mailman
authors.affiliation: Department of Physics, IREAP, and IPST, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Matt
authors.initials: M
authors.lastname: Harrington
authors.affiliation: Department of Physics, IREAP, and IPST, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Michelle
authors.initials: M
authors.lastname: Girvan
authors.affiliation: Department of Physics, IREAP, and IPST, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Losert