Viscoelasticity of 2D liquids quantified in a dusty plasma experiment

Details Viscoelasticity of 2D liquids quantified in a dusty plasma experiment Viscoelasticity of 2D liquids quantified in a dusty plasma experiment

2010-06-15

arxiv.org/abs/1006.3052v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages text, 3 figures, 1 supplementary material, in press Physical Review Letters 2010

Scientific paper

10.1103/PhysRevLett.105.025002

The viscoelasticity of two-dimensional liquids is quantified in an experiment using a dusty plasma. An experimental method is demonstrated for measuring the wavenumber-dependent viscosity, $\eta(k)$, which is a quantitative indicator of viscoelasticity. Using an expression generalized here to include friction, $\eta(k)$ is computed from the transverse current autocorrelation function (TCAF), which is found by tracking random particle motion. The TCAF exhibits an oscillation that is a signature of elastic contributions to viscoelasticity. Simulations of a Yukawa liquid are consistent with the experiment.

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