Simulation of disk- and band-like voids in dusty plasma systems

The minimum-energy configurations of systems of multispecies charged grains of different mass and charge with an interaction potential including long-range repulsive as well as short-range attractive components are studied by molecular dynamics simulation. The grains are also subject to a radial drag force and a quadratic confining potential. It is found that central as well as band-like void regions separating grains of different species can exist as well as coexist, depending on the species parameters. The results are consistent with the horizontal cross-sections of the structures found in a recent experiment on self-organization of chemically synthesizing grains [Huang et al. Chin. Phys. Lett. 21, 121 (2004)].

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