Weak disorder: anomalous transport and diffusion are normal yet again

Details Weak disorder: anomalous transport and diffusion are normal yet again Weak disorder: anomalous transport and diffusion are normal yet again

2010-09-09

arxiv.org/abs/1009.1811v3

Physics

Condensed Matter

Soft Condensed Matter

Substantial improvements in presentation

Scientific paper

Particles driven through a periodic potential by an external constant force are known to exhibit a pronounced peak of the diffusion around a critical force that defines the transition between locked and running states. It has recently been shown both experimentally and numerically that this peak is greatly enhanced if some amount of spatial disorder is superimposed on the periodic potential. Here we show that beyond a simple enhancement lies a much more interesting phenomenology. For some parameter regimes the system exhibits a rich variety of behaviors from normal diffusion to superdiffusion, subdiffusion and even subtransport.

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