Enhanced Diffusion of a Needle in a Planar Course of Point Obstacles

Details Enhanced Diffusion of a Needle in a Planar Course of Point Obstacles Enhanced Diffusion of a Needle in a Planar Course of Point Obstacles

2008-06-06

arxiv.org/abs/0806.1138v2

Phys. Rev. Lett. 101, 120605 (2008)

Physics

Condensed Matter

Statistical Mechanics

accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.120605

The transport of an infinitely thin, hard rod in a random, dense array of point obstacles is investigated by molecular dynamics simulations. Our model mimics the sterically hindered dynamics in dense needle liquids. The center-of-mass diffusion exhibits a minimum, and transport becomes increasingly fast at higher densities. The diffusion coefficient diverges according to a power law in the density with an approximate exponent of 0.8. This observation is connected with a new divergent time scale, reflected in a zig-zag motion of the needle, a two-step decay of the velocity-autocorrelation function, and a negative plateau in the non-Gaussian parameter.

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