Driven k-mers: Correlations in space and time

Details Driven k-mers: Correlations in space and time Driven k-mers: Correlations in space and time

2011-06-20

arxiv.org/abs/1106.3910v2

Phys. Rev. E 84, 041102 (2011)

Physics

Condensed Matter

Statistical Mechanics

11 pages, 9 figures. Version 2: restructuring with small changes in content, published version

Scientific paper

Steady state properties of hard objects with exclusion interaction and a driven motion along a one-dimensional periodic lattice are investigated. The process is a generalization of the asymmetric simple exclusion process (ASEP) to particles of length k, and is called the k-ASEP. Here, we analyze both static and dynamic properties of the k-ASEP. Density correlations are found to display interesting features, such as pronounced oscillations in both space and time, as a consequence of the extended length of the particles. At long times, the density autocorrelation decays exponentially in time, except at a special k-dependent density when it decays as a power law. In the limit of large k at a finite density of occupied sites, the appropriately scaled system reduces to a nonequilibrium generalization of the Tonks gas describing the motion of hard rods along a continuous line. This allows us to obtain in a simple way the known two-particle distribution for the Tonks gas. For large but finite k, we also obtain the leading-order correction to the Tonks result.

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