Glassy Dislocation Dynamics in 2-D Colloidal Dimer Crystals
arXiv:1008.1919 · doi:10.1103/PhysRevLett.105.078301
Abstract
Although glassy relaxation is typically associated with disorder, here we report on a new type of glassy dynamics relating to dislocations within 2-D crystals of colloidal dimers. Previous studies have demonstrated that dislocation motion in dimer crystals is restricted by certain particle orientations. Here, we drag an optically trapped particle through such dimer crystals, creating dislocations. We find a two-stage relaxation response where initially dislocations glide until encountering particles that cage their motion. Subsequent relaxation occurs logarithmically slowly through a second process where dislocations hop between caged configurations. Finally, in simulations of sheared dimer crystals, the dislocation mean squared displacement displays a caging plateau typical of glassy dynamics. Together, these results reveal a novel glassy system within a colloidal crystal.
4 pages + 2 page supp. mat
References in corpus (3)
Cited by in corpus (15)
- Phase-field-crystal models for condensed matter dynamics on atomic length and diffusive time scales: an overview
- Orientationally Glassy Crystals of Janus Spheres
- Degenerate Quasicrystal of Hard Triangular Bipyramids
- Structural behavior and dynamics of an anomalous fluid between solvophilic and solvophobic walls: templating, molding and superdiffusion
- Dynamical facilitation governs glassy dynamics in suspensions of colloidal ellipsoids
- Differently Shaped Hard Body Colloids in Confinement: From passive to active particles
- Criticality of relaxation in dislocation systems
- Stability of liquid crystalline phases in the phase-field-crystal model
- Dimer Covering and Percolation Frustration
- Colloidal suspensions of C-particles: Entanglement, percolation and microrheology
- How does a thermal binary crystal break under shear?
- Orientational ordering and correlations in a quasi-one-dimensional hard-dumbbell fluid
- Crossover from Jamming to Clogging Behaviors in Heterogeneous Environments
- Liquid crystalline growth within a phase-field crystal model
- Morphology, Polarization Patterns, Compression, and Entropy Production in Phase-Separating Active Dumbbell Systems