Flux reversal in a two-state symmetric optical thermal ratchet

Details Flux reversal in a two-state symmetric optical thermal ratchet Flux reversal in a two-state symmetric optical thermal ratchet

2005-06-13

arxiv.org/abs/cond-mat/0506285v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures, accepted for publication in Physical Review E, Rapid Communications

Scientific paper

10.1103/PhysRevE.71.060102

A Brownian particle's random motions can be rectified by a periodic potential energy landscape that alternates between two states, even if both states are spatially symmetric. If the two states differ only by a discrete translation, the direction of the ratchet-driven current can be reversed by changing their relative durations. We experimentally demonstrate flux reversal in a symmetric two-state ratchet by tracking the motions of colloidal spheres moving through large arrays of discrete potential energy wells created with dynamic holographic optical tweezers. The model's simplicity and high degree of symmetry suggest possible applications in molecular-scale motors.

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