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Dynamics of a Dust Crystal with Two Different Size Dust Species

L. S. Matthews·K. Qiao·T. W. Hyde
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Abstract

A self-consistent three-dimensional model for a complex (dusty) plasma is used to study the effects of multiple-sized dust grains in a dust crystal. In addition to the interparticle forces, which interact through a Yukawa potential, the model includes the effects of gravity, the variation of the sheath potential above the powered electrode, and a radial confining potential. Simulations studied various ratios of a mix of 6.5- and 8.9-micron monodisperse particles and compared their correlation functions, electric potential energy of the crystal formations, and the dispersion relations for in-plane and out-of-plane dust lattice wave (DLW) modes for two different sheath thicknesses. In the 7 mm sheath, the particles formed two layers in the vertical direction by size, and acted as a two-layer crystal with weak correlation between the layers. In the 3 mm sheath, the particles formed an essentially monolayer crystal; however the crystal dynamics showed some characteristics of a bilayer crystal.

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L. S. Matthews, K. Qiao, T. W. Hyde. 2005-06-30. Dynamics of a Dust Crystal with Two Different Size Dust Species. https://doi.org/10.1016/j.asr.2005.06.037

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