AI Article Synopsis
- Electrically driven nematic liquid crystal layers provide a unique environment for studying umbilical defects and their interactions.
- In homogeneous samples, the number of defects decreases over time due to a coarsening process, but the presence of glass beads alters the coarsening exponent.
- Additionally, slightly deformed beads impact the molecular distribution and attract topological vortices, showing predominantly quadrupolar behavior, with a theoretical model suggesting a 2/3 exponent that aligns with experimental findings.
Article Abstract
Electrically driven nematic liquid crystals layers are ideal contexts for studying the interactions of local topological defects, umbilical defects. In homogeneous samples the number of defects is expected to decrease inversely proportional to time as a result of defect-pair interaction law, so-called coarsening process. Experimentally, we characterize the coarsening dynamics in samples containing glass beads as spacers and show that the inclusion of such imperfections changes the exponent of the coarsening law. Moreover, we demonstrate that beads that are slightly deformed alter the surrounding molecular distribution and attract vortices of both topological charges, thus, presenting a mainly quadrupolar behavior. Theoretically, based on a model of vortices diluted in a dipolar medium, a 2/3 exponent is inferred, which is consistent with the experimental observations.
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| http://dx.doi.org/10.1103/PhysRevE.101.062704 | DOI Listing |
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