Colloidal Lattice Shearing and Rupturing with a Driven Line of Particles

Abstract

We examine the dynamics of two-dimensional colloidal systems using numerical simulations of a system with a drive applied to a thin region in the middle of the sample to produce a local shear. For a monodisperse colloidal assembly, we find a well defined decoupling transition separating a regime of elastic motion from a plastic phase where the particles in the driven region break away or decouple from the particles in the bulk, producing a shear band. For a bidisperse assembly, we find that the onset of a bulk disordering transition coincides with the broadening of the shear band. We identify several distinct dynamical regimes that are correlated with features in the velocity-force curves. As a function of bidispersity, the decoupling force shows a nonmonotonic behavior associated with features in the noise fluctuations, power spectra, and bulk velocity profiles. When pinning is added in the bulk, we find that the shear band regions can become more localized, causing a decoupling of the driven particles from the bulk particles. For a system with thermal noise and no pinning, the shear band region becomes more extended and the average velocity of the driven particles drops at the thermal disordering transition of the bulk system.

11 pages, 15 postscript figures

References in corpus (35)

• Nonequilibrium Dynamic Phase Diagram for Vortex Lattices
• Shear Flows and Shear Viscosity in a Two-Dimensional Yukawa System (Dusty Plasma)
• Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor
• Generic properties of a quasi-one dimensional classical Wigner crystal
• Forced motion of a probe particle near the colloidal glass transition
• Multiscaling at Point J: Jamming is a Critical Phenomenon
• Mode locking of vortex matter driven through mesoscopic channels
• Colloidal Dynamics on Disordered Substrates
• Controlled Manipulation of Individual Vortices in a Superconductor
• Lane reduction in driven 2d-colloidal systems through microchannels
• Complex Dynamical Flow Phases and Pinning in Superconductors with Rectangular Pinning Arrays
• Journey of an intruder through the fluidisation and jamming transitions of a dense granular media
• Evolution of shear-induced melting in dusty plasma
• Critical behavior of plastic depinning of vortex lattices in two dimensions: Molecular dynamics simulations
• Depinning by Fracture in a Glassy Background
• Bias- and bath-mediated pairing of particles driven through a quiescent medium
• Local Melting and Drag for a Particle Driven Through a Colloidal Crystal
• Optically bound microscopic particles in one dimension
• Microstructure of a liquid complex (dusty) plasma under shear
• Directional Locking Effects and Dynamics for Particles Driven Through a Colloidal Lattice
• Schematic Models for Active Nonlinear Microrheology
• Magnetic-force-microscope study of interlayer "kinks" in individual vortices in underdoped cuprate YBa${}_2$Cu${}_3$O${}_{6+x}$ superconductor
• Fluctuations, Jamming, and Yielding for a Driven Probe Particle in Disordered Disk Assemblies
• Intruder mobility in a vibrated granular packing
• Dynamics of an Intruder in Dense Granular Fluids
• Crossover from Intermittent to Continuum Dynamics for Locally Driven Colloids
• Viscous Decoupling Transitions for Individually Dragged Particles in Systems with Quenched Disorder
• Local elastic response measured near the colloidal glass transition
• Rhythmic cluster generation in strongly driven colloidal dispersions
• Positive and Negative Drag, Dynamic Phases, and Commensurability in Coupled One-Dimensional Channels of Particles with Yukawa Interactions
• Microrheology of supercooled liquids in terms of a continuous time random walk
• Hydrodynamic interactions in active colloidal crystal microrheology
• The Effect of Pinning on Drag in Coupled One-Dimensional Channels of Particles
• Coulomb Drag between One-Dimensional Wigner Crystal Rings
• Negative differential mobility of weakly driven particles in models of glass formers

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