title: Dynamical phase of driven colloidal systems with short-range attraction and long-range repulsion.
abstract: We study the nonequilibrium dynamics of colloidal system with short-range depletion attraction and screened electrostatic repulsion on a disordered substrate. We find a growth-melting process of the clusters as the temperature is increased. By strengthening the screened electrostatic repulsion, a depinning transition from moving cluster to plastic flow is observed, which is characterized by a peak in threshold depinning force. The corresponding phase diagram is then mapped out. Due to the influences of disorder from substrate, the clusters are polarized by the strong external force, accompanied by the appearance of interesting orientational order parallel to the force and translational order perpendicular to the force. Under the condition of strong external force, the influences of density of pins and temperature are also studied.
authors.affiliation: Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China. jxchen@hdu.edu.cn
authors.forename: Jiang-Xing
authors.initials: JX
authors.lastname: Chen
authors.forename: Jun-Wen
authors.initials: JW
authors.lastname: Mao
authors.forename: Snigdha
authors.initials: S
authors.lastname: Thakur
authors.forename: Jiang-Rong
authors.initials: JR
authors.lastname: Xu
authors.forename: Fu-yang
authors.initials: FY
authors.lastname: Liu
mesh_terms: D003102:Colloids / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D044367:Phase Transition; D055672:Static Electricity; D013696:Temperature
chemical_list: D003102:Colloids