Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2009-04-27
EPL, 87 (2009) 56001
Physics
Condensed Matter
Disordered Systems and Neural Networks
6 pages, 14 figures
Scientific paper
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.
Doussal Pierre Le
Moulinet Sebastien
Rolley Etienne
Wiese Kay Joerg
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