Dynamic phases, clustering, and chain formation for driven disk systems in the presence of quenched disorder

Physical Review. E
Y YangC Reichhardt

Abstract

We numerically examine the dynamic phases and pattern formation of two-dimensional monodisperse repulsive disks driven over random quenched disorder. We show that there is a series of distinct dynamic regimes as a function of increasing drive, including a clogged or pile-up phase near depinning, a homogeneous disordered flow state, and a dynamically phase separated regime consisting of high-density crystalline regions surrounded by a low density of disordered disks. At the highest drives the disks arrange into one-dimensional moving chains. The phase separated regime has parallels with the phase separation observed in active matter systems, but arises from a distinct mechanism consisting of the combination of nonequilibrium fluctuations with density-dependent mobility. We discuss the pronounced differences between this system and previous studies of driven particles with longer-range repulsive interactions moving over random substrates, such as superconducting vortices or electron crystals, where dynamical phase separation and distinct one-dimensional moving chains are not observed. Our results should be generic to a broad class of systems in which the particle-particle interactions are short ranged, such as sterically interact...Continue Reading

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Citations

Jun 17, 2018·Physical Review. E·C Reichhardt, C J O Reichhardt
May 20, 2020·Physical Review. E·D McDermottC Reichhardt
Nov 24, 2018·The Journal of Chemical Physics·R B JadrichT M Truskett
Nov 24, 2018·The Journal of Chemical Physics·R B JadrichT M Truskett
Jun 23, 2018·Physical Review Letters·Fernando Peruani, Igor S Aranson

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