Physics – Condensed Matter
Scientific paper
1997-06-11
Physics
Condensed Matter
To appear in Journal de Physique I, 6 pages, 4 figures included using epfs macros
Scientific paper
10.1051/jp1:1997116
We study the local scaling properties of driven interfaces in disordered media modeled by the Edwards-Wilkinson equation with quenched noise. We find that, due to the super-rough character of the interface close to the depinning transition, the local width exhibits an anomalous temporal scaling. It does not saturate at a characteristic time $t_s(l) \sim l^z$ as expected, but suffers an anomalous temporal crossover to a different time regime $t^{\beta_*}$, where $\beta_* \simeq 0.21 $. This is associated with the existence of a local roughness exponent $\alpha_{loc} \simeq 1$ that differs from the global one $\alpha \simeq 1.2$. The relevance of the typical size of pinned sites regions near the critical point is investigated and the definition of the critical depinning is dicussed.
López Juan M.
Rodriguez Miguel A.
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