Direct measurement of shear-induced cross-correlations of Brownian motion

Details Direct measurement of shear-induced cross-correlations of Brownian motion Direct measurement of shear-induced cross-correlations of Brownian motion

2009-09-02

arxiv.org/abs/0909.0401v3

Phys. Rev. Lett. 103, 230602 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.230602

Shear-induced cross-correlations of particle fluctuations perpendicular and along stream-lines are investigated experimentally and theoretically. Direct measurements of the Brownian motion of micron-sized beads, held by optical tweezers in a shear-flow cell, show a strong time-asymmetry in the cross-correlation, which is caused by the non-normal amplification of fluctuations. Complementary measurements on the single particle probability distribution substantiate this behavior and both results are consistent with a Langevin model. In addition, a shear-induced anti-correlation between orthogonal random-displacements of two trapped and hydrodynamically interacting particles is detected, having one or two extrema in time, depending on the positions of the particles.

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