Uniqueness of the thermodynamic limit for driven disordered elastic interfaces

Abstract

We study the finite size fluctuations at the depinning transition for a one-dimensional elastic interface of size $L$ displacing in a disordered medium of transverse size $M=k{L}^{\zeta }$ with periodic boundary conditions, where $\zeta$ is the depinning roughness exponent and $k$ is a finite aspect ratio parameter. We focus on the crossover from the infinitely narrow ($k\to 0$) to the infinitely wide ($k\to \infty$) medium. We find that at the thermodynamic limit both the value of the critical force and the precise behavior of the velocity-force characteristics are {\it unique} and $k$-independent. We also show that the finite size fluctuations of the critical force (bias and variance) as well as the global width of the interface cross over from a power-law to a logarithm as a function of $k$. Our results are relevant for understanding anisotropic size-effects in force-driven and velocity-driven interfaces.

10 pages, 12 figures

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• Localization of soft modes at the depinning transition
• Finite-Time and -Size Scalings in the Evaluation of Large Deviation Functions: Numerical Approach in Continuous Time
• Driven interfaces: from flow to creep through model reduction
• Effect of disorder geometry on the critical force in disordered elastic systems
• On the critical region of long-range depinning transitions
• A numerical study of the statistics of roughness parameters for fluctuating interfaces
• Theory and Experiments for Disordered Elastic Manifolds, Depinning, Avalanches, and Sandpiles
• Depinning free of the elastic approximation
• Dual Role for Heterogeneity in Dynamic Fracture