Giant Colloidal Diffusivity on Corrugated Optical Vortices

Details Giant Colloidal Diffusivity on Corrugated Optical Vortices Giant Colloidal Diffusivity on Corrugated Optical Vortices

2006-03-21

arxiv.org/abs/cond-mat/0603558v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.190601

A single colloidal sphere circulating around a periodically modulated optical vortex trap can enter a dynamical state in which it intermittently alternates between freely running around the ring-like optical vortex and becoming trapped in local potential energy minima. Velocity fluctuations in this randomly switching state still are characterized by a linear Einstein-like diffusion law, but with an effective diffusion coefficient that is enhanced by more than two orders of magnitude.

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