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Gerbode SJ, Agarwal U, Ong DC, et al. Glassy dislocation dynamics in 2D colloidal dimer crystals. Phys Rev Lett. 2010;105(7):078301doi: 10.1103/PhysRevLett.105.078301.
Gerbode, S. J., Agarwal, U., Ong, D. C., Liddell, C. M., Escobedo, F., & Cohen, I. (2010). Glassy dislocation dynamics in 2D colloidal dimer crystals. Physical review letters, 105(7), 078301. https://doi.org/10.1103/PhysRevLett.105.078301
Gerbode, Sharon J, et al. "Glassy dislocation dynamics in 2D colloidal dimer crystals." Physical review letters vol. 105,7 (2010): 078301. doi: https://doi.org/10.1103/PhysRevLett.105.078301
Gerbode SJ, Agarwal U, Ong DC, Liddell CM, Escobedo F, Cohen I. Glassy dislocation dynamics in 2D colloidal dimer crystals. Phys Rev Lett. 2010 Aug 13;105(7):078301. doi: 10.1103/PhysRevLett.105.078301. Epub 2010 Aug 09. PMID: 20868079.
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Phys Rev Lett. 2010 Aug 13;105(7):078301. doi: 10.1103/PhysRevLett.105.078301. Epub 2010 Aug 09.

Glassy dislocation dynamics in 2D colloidal dimer crystals.

Physical review letters

Sharon J Gerbode, Umang Agarwal, Desmond C Ong, Chekesha M Liddell, Fernando Escobedo, Itai Cohen

Affiliations

  1. Department of Physics, Cornell University, Ithaca, New York 14853, USA.

PMID: 20868079 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 2D 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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