Elementary edge and screw dislocations visualized at the lattice periodicity level in smectic phase of colloidal rods
arXiv:1808.00798 · doi:10.1103/PhysRevLett.121.097801
Abstract
We report on the identification and quantitative characterization of elementary edge and screw dislocations in a colloidal smectic phase of tip-labeled rods. Thanks to the micrometer layer spacing, direct visualization of dislocations has been performed at the \textit{smectic periodicity scale} by optical fluorescence microscopy. As a result, the displacement field around an edge dislocation has been experimentally established and compared with the profile predicted by elastic theory. Elementary screw dislocations have been also evidenced, for which the core size as well as the \textit{in situ} handedness have been determined. Self-diffusion experiments performed at the individual particle level reveal for the first time nematic-like or "melted" ordering of the defect core.
arXiv comment5 pages, 5 figures, accepted in PRL
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- Complex-tensor theory of simple smectics
- Self-organisation of tip functionalised elongated colloidal particles
- Elastic response of colloidal smectics: insights from microscopic theory
- Topological fine structure of smectic grain boundaries and tetratic disclination lines within three-dimensional smectic liquid crystals