Umbilical defect dynamics in an inhomogeneous nematic liquid crystal layer

Zambra, V., Clerc, M.G, Barboza, R., Bortolozzo, U., Residori S.

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. Experi- mentally, 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.

Más información

Título de la Revista: PHYSICAL REVIEW E
Volumen: 101
Editorial: AMER PHYSICAL SOC
Fecha de publicación: 2020
Página de inicio: 062704
Página final: 062704
Idioma: Ingles
Notas: ISI WOS