Delev V.A.
Dynamics of dislocations in the domain structure of the nematic liquid crystal. Multiphase Systems. 15 (2020) 3–4. 201–207 (in Russian).
Dynamics of dislocations in the domain structure of the nematic liquid crystal
Delev V.A.
Institute of Molecule and Crystal Physics UFRC RAS, Ufa
Abstract
Dynamics and interaction of classical dislocations in the domain structure of π/2 nematic liquid crystal is studied. A
feature of twisted nematics is that hydrodynamic flows in Williams domains, together with the tangential component
of velocity, also have an axial component, the direction of which is opposite in neighboring domains. Dislocations can
move both perpendicular (glide) to Williams domains, and along (climb) them. It was found that when dislocations
collide with opposite topological charges S = ±1 at given voltage, their speed increases. It has been shown that
dynamics and interaction of dislocations with topological charges S = ±1 are qualitatively well described by the
perturbed sine-Gordon equation.
Keywordsnematic liquid crystal,
domain structure,
dislocation,
kink,
sine-Gordon equation
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