Jamming in systems with quenched disorder

摘要

We numerically study the effect of adding quenched disorder in the form of randomly placed pinning sites onnjamming transitions in a disk packing that jams at a well-defined point J in the clean limit. Quenched disorderndecreases the jamming density and introduces a depinning threshold. The onset of a finite threshold coincidesnwith point J at the lowest pinning densities, but for higher pinning densities there is always a finite depinningnthreshold even well below jamming. We find that proximity to point J strongly affects the transport curves andnnoise fluctuations, and we observe a change from plastic behavior below jamming, where the system is highlynheterogeneous, to elastic depinning above jamming. Many of the general features we find are related to othernsystems containing quenched disorder, including the peak effect observed in vortex systems.