Test of the Stokes-Einstein relation in a two-dimensional Yukawa liquid

The Stokes-Einstein relation, relating the diffusion and viscosity coefficients D and eta, is tested in two dimensions. An equilibrium molecular-dynamics simulation was used with a Yukawa pair potential. Regimes are identified where motion is diffusive and D is meaningful. The Stokes-Einstein relati...

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Bibliographic Details
Published in:Physical review letters 2006-01, Vol.96 (1), p.015005-015005, Article 015005
Main Authors: Liu, Bin, Goree, J, Vaulina, O S
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIFFUSION
EQUILIBRIUM
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LIQUIDS
MOLECULAR DYNAMICS METHOD
PARTICLES
PLASMA
PLASMA SIMULATION
POTENTIAL ENERGY
TWO-DIMENSIONAL CALCULATIONS
VISCOSITY
YUKAWA POTENTIAL
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Summary:The Stokes-Einstein relation, relating the diffusion and viscosity coefficients D and eta, is tested in two dimensions. An equilibrium molecular-dynamics simulation was used with a Yukawa pair potential. Regimes are identified where motion is diffusive and D is meaningful. The Stokes-Einstein relation, Deta proportional k(B)T, was found to be violated near the disordering transition; under these conditions collective particle motion exhibits dynamical heterogeneity. At slightly higher temperatures, however, the Stokes-Einstein relation is valid. These results may be testable in strongly coupled dusty plasma experiments.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.96.015005