Dispersionless motion in a driven periodic potential

Details Dispersionless motion in a driven periodic potential Dispersionless motion in a driven periodic potential

2009-08-07

arxiv.org/abs/0908.1024v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

Recently, dispersionless (coherent) motion of (noninteracting) massive Brownian particles, at intermediate time scales, was reported in a sinusoidal potential with a constant tilt. The coherent motion persists for a finite length of time before the motion becomes diffusive. We show that such coherent motion can be obtained repeatedly by applying an external zero-mean square-wave drive of appropriate period and amplitude, instead of a constant tilt. Thus, the cumulative duration of coherent motion of particles is prolonged. Moreover, by taking an appropriate combination of periods of the external field, one can postpone the beginning of the coherent motion and can even have coherent motion at a lower value of position dispersion than in the constant tilt case.

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