Umbilical defect dynamics in an inhomogeneous nematic liquid crystal layer
Author
dc.contributor.author
Zambra, Valeska
Author
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Clerc Gavilán, Marcel
Author
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Barboza, Raouf
Author
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Bortolozzo, Umberto
Author
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Residori, Stefania
Admission date
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2020-08-03T20:05:14Z
Available date
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2020-08-03T20:05:14Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
Physical Review E 101, 062704 (2020)
es_ES
Identifier
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10.1103/PhysRevE.101.062704
Identifier
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https://repositorio.uchile.cl/handle/2250/176264
Abstract
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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.
es_ES
Patrocinador
dc.description.sponsorship
Millennium Institute for Research in Optics
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
1180903