Long-time tail in an electric conduction system

Details Long-time tail in an electric conduction system Long-time tail in an electric conduction system

2008-07-31

arxiv.org/abs/0807.4979v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 3 figures, submitted to Prog. Theor. Phys. Suppl. as a Proceedings of the 50th Anniversary of the Alder transition

Scientific paper

The long-time behavior of the velocity autocorrelation function in a classical two-dimensional electric conduction system is studied by the molecular dynamics simulation. In equilibrium, the effect of coexistence of many-body interactions and a random potential is investigated. A crossover from a positive tail proportional to $t^{-1}$, to a negative tail proportional to $-t^{-2}$ is observed as the strength of the random potential increases. In nonequilibrium, the positive tail is enhanced whereas the negative tail appears at earlier times as an electric field increases.

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