Diffusion of Point Defects in Two-Dimensional Colloidal Crystals

Details Diffusion of Point Defects in Two-Dimensional Colloidal Crystals Diffusion of Point Defects in Two-Dimensional Colloidal Crystals

2001-03-11

arxiv.org/abs/cond-mat/0103239v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages (REVTEX), 5 figures (PS)

Scientific paper

10.1038/35093077

We report the first study of the dynamics of point defects, mono and di-vacancies, in a confined 2-D colloidal crystal in real space and time using digital video microscopy. The defects are introduced by manipulating individual particles with optical tweezers. The diffusion rates are measured to be $D_{mono}/a^{2}\cong3.27\pm0.03$Hz for mono-vacancies and $D_{di}/a^{2}\cong3.71\pm0.03$Hz for di-vacancies. The elementary diffusion processes are identified and it is found that the diffusion of di-vacancies is enhanced by a \textit{dislocation dissociation-recombination} mechanism. Furthermore, the defects do not follow a simple random walk but their hopping exhibits memory effects, due to the reduced symmetry (compared to the triangular lattice) of their stable configurations, and the slow relaxation rates of the lattice modes.

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