Category: Physics

Summary: Testing whether an intermediate mixture of point and columnar disorder maximizes avalanche localization and broadens depinning-threshold variability.

Depinning of an elastic line is strongly shaped by the geometry of the disorder that pins it. This experiment asks what happens when the medium contains both point-like disorder and columnar defects, instead of either type alone.

At fixed total disorder variance, the model varies the columnar fraction and the degree of patchy clustering among the columns. The target is a crossover regime where avalanches become especially localized and the distribution of critical depinning forces broadens beyond what is seen in purely point or purely columnar settings.

That is interesting because disorder type is usually treated as a binary choice. The experiment instead studies mixtures and asks whether combining the two pinning geometries creates a distinctive finite-size regime of threshold variability and spatially focused motion.

Method: Repeated elastic-line depinning simulations with mixed point and columnar disorder, sweeping columnar fraction and clustering at fixed overall disorder variance.

What is measured: Critical-force distribution, avalanche localization, dependence on columnar fraction and clustering, and comparison with pure point and pure columnar disorder.