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 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.
Liu
Bin
B
Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242, USA.
Goree
J
J
Vaulina
O S
OS