2013
DOI: 10.1098/rspa.2013.0204
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Quaternions and hybrid nematic disclinations

Abstract: Disclination lines in nematic liquid crystals can exist in different geometric conformations, characterized by their director profile. In certain confined colloidal suspensions and even more prominently in chiral nematics, the director profile may vary along the disclination line. We construct a robust geometric decomposition of director profile in closed disclination loops and use it to apply topological classification to linked loops with arbitrary variation of the profile, generalizing the self-linking numb… Show more

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Cited by 22 publications
(24 citation statements)
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“…In nematics in general there is no restriction for the director in the cross-section of a disclination with half-integer winding to be in-plane and the winding profile of a disclinations can change. Because of this, all line defects with a half-integer winding number director profile, which does not change along the length of the disclination, are topologically equivalent [32][33][34].…”
Section: Topological Defects In Two Dimensionsmentioning
confidence: 99%
See 3 more Smart Citations
“…In nematics in general there is no restriction for the director in the cross-section of a disclination with half-integer winding to be in-plane and the winding profile of a disclinations can change. Because of this, all line defects with a half-integer winding number director profile, which does not change along the length of the disclination, are topologically equivalent [32][33][34].…”
Section: Topological Defects In Two Dimensionsmentioning
confidence: 99%
“…Because the total topological charge is determined by the topology of the confinement, and the anchoring conditions, the choice of the branch cut surface also changes the topological charge of the ring defect. Without selecting a branch cut surface, one can still tell if the topological charge of a defect line is odd or even: if the director profile of the defect line with half-integer winding is fixed, the topological charge is odd, and if the profile changes, it can be odd or even, depending on the number of changes [33,47]. Without a selected branch cut surface to define the signs of the topological charges, the conserved topological quantity is the sum of the topological charges modulo 2 [7,32,33,48].…”
Section: Three-dimensional Topological Defectsmentioning
confidence: 99%
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“…1I show the details of the director configurations around the +1/2 (red box) and −1/2 (blue box) disclination profiles. The transition between the two proceeds by rotating the director by π around an axis perpendicular to the disclination line (see figure 2 in [56]). Such a peculiar topology indeed yields zero topological point charge, as explained in [56].…”
Section: Numerical Computationsmentioning
confidence: 99%