尘埃等离子体实验中二维液体的粘弹性
Viscoelasticity of 2D liquids quantified in a dusty plasma experiment
摘要：
二维液体的粘弹性是量化的实验中使用的尘埃等离子体。实验方法被证明用于测量波数依赖性粘度，$η(k)$，这是粘弹性的定量指标。使用这里概括为包括摩擦力的表达式，从横向电流自相关函数（TCAF）计算$η(k)$，该函数通过跟踪随机粒子运动而得到。TCAF表现出振荡，这是弹性对粘弹性的贡献的标志。汤川液体的模拟结果与实验结果一致。
英文摘要：
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, $η(k)$, which is a quantitative indicator of viscoelasticity. Using an expression generalized here to include friction, $η(k)$ 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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