Simulating critical dynamics in liquid mixtures: short-range and long-range contributions.
Recently, Das et al. [J. Chem. Phys. 125, 024506 (2006)] established that computer simulations of critical dynamics in a binary Lennard-Jones mixture are consistent with the predicted Stokes-Einstein behavior of the asymptotic decay rate of the order-parameter fluctuations near criticality. Here, we show that the noncritical or "background" contributions to the computed diffusion coefficient are also in agreement with both theory and experiment, thus further validating the feasibility of molecular dynamics simulations for studying dynamic critical behavior.
Das
Subir K
SK
Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, USA.
Sengers
Jan V
JV
Fisher
Michael E
ME