接触线的高度起伏：重整化无序关联函数的直接测量
Height fluctuations of a contact line: a direct measurement of the renormalized disorder correlator
摘要：
我们已经测量了两个不同的系统：液氢上的粗糙铯衬底和异丙醇上的硅晶片接枝硅烷化补丁在脱钉的接触线的高度的质心波动。接触线受重力提供的封闭方形井的约束。从第二累积量的高度波动，我们测量的重正化的障碍关联函数Delta（u），预测功能RG理论达到一个固定点，只要毛细管长度是大的相比，Larkin长度设置的微观障碍。实验与函数RG预测的Delta（u）的渐近形式一致，包括u=0处的线性尖点。观测到的微小偏差可用作潜在物理过程的探测器。的第三个时刻，以及雪崩的大小分布测量和预测功能RG相比。
英文摘要：
We have measured the center-of-mass fluctuations of the height of a contact line at depinning for two different systems: liquid hydrogen on a rough cesium substrate and isopropanol on a silicon wafer grafted with silanized patches. The contact line is subject to a confining quadratic well, provided by gravity. From the second cumulant of the height fluctuations, we measure the renormalized disorder correlator Delta(u), predicted by the Functional RG theory to attain a fixed point, as soon as the capillary length is large compared to the Larkin length set by the microscopic disorder. The experiments are consistent with the asymptotic form for Delta(u) predicted by Functional RG, including a linear cusp at u=0. The observed small deviations could be used as a probe of the underlying physical processes. The third moment, as well as avalanche-size distributions are measured and compared to predictions from Functional RG.
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