title: Stripes, clusters, and nonequilibrium ordering for bidisperse colloids with repulsive interactions.
abstract: We show that two-dimensional bidisperse assemblies of colloids with strictly repulsive interactions exhibit stripe, cluster, and partially crystallized states when driven over a quenched random substrate. The nonequilibrium states on a substrate are significantly more ordered than equilibrium states both with and without substrates. A minimum substrate strength is necessary to induce the nonequilibrium pattern formation. Our results suggest that a combination of driving and quenched disorder offers a new approach to controlling pattern formation in colloid mixtures.
authors.affiliation: Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: C
authors.initials: C
authors.lastname: Reichhardt
authors.forename: C J Olson
authors.initials: CJ
authors.lastname: Reichhardt