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Microdiffusion in (2 + 1)-dimensional chain-bundle dusty-plasma liquids

Chong-Wai Io and Lin I

  • Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan 32001, Republic of China

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Phys. Rev. E 85, 026407 – Published 21 February, 2012

DOI: https://doi.org/10.1103/PhysRevE.85.026407

Abstract

Microdiffusion in a (2 + 1)-dimensional liquid with flexible long longitudinal chain bundles, formed by negatively charged dusts suspended in a low-pressure Ar gaseous discharge, is investigated. With increasing time scale τ, the transverse hopping dominated displacement induces the transition from the sub- to the superdiffusion of the single dust, and the growth of spatial displacement correlation of two dusts, which suppresses their relative diffusion. The rise time of displacement correlation increases with dust separation. The bond breaking around the hopping cluster boundary is the main source for long time relative diffusion and causes the presence of the multiple shoulders in the fat tails of the non-Gaussian relative displacement histograms. The stronger longitudinal coupling than the transverse coupling strongly enhances the motion correlation over much larger separation, and suppresses the bond-breaking rate and the relative diffusion of the longitudinal dust pairs.

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Outline

Information

Phys. Rev. E 85, 026407– Published 21 February, 2012
  • Received 31 August 2011

©2012 American Physical Society

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