title: Multiple void formation in plasmas containing multispecies charged grains.
abstract: Self-organized separation of charged-dust species in two-dimensional dusty plasmas is studied by means of molecular-dynamics simulation. The multispecies dust grains, interacting through a screened Coulomb potential with a long-range attractive component, are confined by an external quadratic potential and subjected to a radially outward ion drag force. It is found that, in general, the species are spatially separated by bandlike dust-free (or void) regions, and grains of the same species tend to populate a common shell. At large ion drag and/or large plasma screening, a central disklike void as well as concentric bandlike voids separating the different species appear. Because of the outward drag and the attractive component of the dust-dust interaction forces, highly asymmetrical states consisting of species-separated dust clumps can also exist despite the fact that all the forces are either radial or central.
authors.affiliation: Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium.
authors.forename: Y H
authors.initials: YH
authors.lastname: Liu
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Chen
authors.forename: M Y
authors.initials: MY
authors.lastname: Yu
authors.forename: A
authors.initials: A
authors.lastname: Bogaerts