Glassy Dislocation Dynamics in 2-D Colloidal Dimer Crystals

Details Glassy Dislocation Dynamics in 2-D Colloidal Dimer Crystals Glassy Dislocation Dynamics in 2-D Colloidal Dimer Crystals

2010-08-11

arxiv.org/abs/1008.1919v1

Phys. Rev. Lett. 105, 078301 (2010)

Physics

Condensed Matter

Soft Condensed Matter

4 pages + 2 page supp. mat

Scientific paper

10.1103/PhysRevLett.105.078301

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.

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