Landau-de Gennes theory of the core structure of a screw dislocation in smectic A liquid crystals
作者:
S. Kralj,
T.J. Sluckin,
期刊:
Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 18,
issue 6
页码: 887-902
ISSN:0267-8292
年代: 1995
DOI:10.1080/02678299508036707
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We present details of calculations of the core structure of a screw dislocation in a smectic A liquid crystal, using the phenomenological Landau-de Gennes free energy functional. The order parameter frustration created by topological constraints far from the dislocation core is resolved in one of three qualitatively different ways. The three types of dislocation core solution are the DT (double twist), CL (classical), and BP (broken polar symmetry) solutions, respectively. The stability requirements for these structures are discussed, as a function of temperature, smectic elastic properties, and coupling between smectic and nematic order. The effect of possible inhomogeneity between left- and right-handed conformers is also examined.
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