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The structure of disintegrating defect clusters in smectic C freely suspended films

  • Disclinations or disclination clusters in smectic C freely suspended films with topological charges larger than one are unstable. They disintegrate, preferably in a spatially symmetric fashion, into single defects with individual charges of +1, which is the smallest positive topological charge allowed in polar vector fields. While the opposite process of defect annihilation is well-defined by the initial defect positions, disintegration starts from a singular state and the following scenarioDisclinations or disclination clusters in smectic C freely suspended films with topological charges larger than one are unstable. They disintegrate, preferably in a spatially symmetric fashion, into single defects with individual charges of +1, which is the smallest positive topological charge allowed in polar vector fields. While the opposite process of defect annihilation is well-defined by the initial defect positions, disintegration starts from a singular state and the following scenario including the emerging regular defect patterns must be selected by specific mechanisms. We analyze experimental data and compare them with a simple model where the defect clusters adiabatically pass quasi-equilibrium solutions in one-constant approximation. It is found that the defects arrange in geometrical patterns that correspond very closely to superimposed singular defect solutions, without additional director distortions. The patterns expand by affine transformations where all distances between individual defects scale with the same time-dependent scaling factor proportional to the square-root of time.show moreshow less

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Metadaten
Author:Ralf Stannarius, Kirsten Harth
URL:https://pubs.rsc.org/en/content/articlelanding/2023/sm/d3sm00808h
DOI:https://doi.org/https://doi.org/10.1039/d3sm00808h
Parent Title (English):Soft Matter
Publisher:Royal Society of Chemistry
Document Type:Article
Language:English
Year of Publishing:2023
Date of Publication (online):2024/02/06
Publishing Institution:Technische Hochschule Brandenburg
Release Date:2024/02/07
Issue:19
Page Number:6
First Page:6109
Last Page:6115
Institutes:Fachbereich Technik
University Bibliography:Hochschulbibliografie
Licence (German):Creative Commons - CC BY - Namensnennung 4.0
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