Topological defects in cholesteric liquid crystal shells. Issue 46 (21st October 2016)

• Record Type: Journal Article
• Authors: Darmon, Alexandre; Benzaquen, Michael; Čopar, Simon; Dauchot, Olivier; Lopez-Leon, Teresa
• Is Part Of: Soft matter. Volume 12:Issue 46(2016)
• Page Start: 9280
• Page End: 9288
• Publication Date: 2016-10-21
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c6sm01748g
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : We investigate the defect configurations emerging when a cholesteric liquid crystal is confined to a spherical shell. Abstract : We investigate experimentally and numerically the defect configurations emerging when a cholesteric liquid crystal is confined to a spherical shell. We uncover a rich scenario of defect configurations, some of them non-existent in nematic shells, where new types of defects are stabilized by the helical ordering of the liquid crystal. In contrast to nematic shells, here defects are not simple singular points or lines, but have a large structured core. Specifically, we observe five different types of cholesteric shells. We study the statistical distribution of the different types of shells as a function of the two relevant geometrical dimensionless parameters of the system. By playing with these parameters, we are able to induce transitions between different types of shells. These transitions involve interesting topological transformations in which the defects recombine to form new structures. Surprisingly, the defects do not approach each other by taking the shorter distance route (geodesic), but by following intricate paths.