Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-07-18
Physics
Condensed Matter
Statistical Mechanics
12 pages, 5 figures
Scientific paper
10.1143/JPSJ.76.093001
The long-time behavior of the velocity autocorrelation function (VACF) is investigated by the molecular dynamics simulation of a two-dimensional system which has both a many-body interaction and a random potential. With strengthening the random potential by increasing the density of impurities, a crossover behavior of the VACF is observed from a positive tail, which is proportional to t^{-1}, to a negative tail, proportional to -t^{-2}. The latter tail exists even when the density of particles is the same order as the density of impurities. The behavior of the VACF in a nonequilibrium steady state is also studied. In the linear response regime the behavior is similar to that in the equilibrium state, whereas it changes drastically in the nonlinear response regime.
Shimizu Akira
Yuge Tatsuro
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