Wedge-screw dispiration in smectic liquid crystals with antiferroelectric order |
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Authors: | L Lejček V Dvořák |
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Institution: | (1) Institute of Physics, Czech Acad. Sci., Na Slovance 2, 180 40 Praha 8, Czech Republic |
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Abstract: | Using the approximative expression for the elastic energy density of the antiferroelectric (AF) liquid crystal the elastic self-energy of ( , b)-wedge-screw dispiration is estimated. Then the elastic interaction between ( , b)-wedge-screw dispiration and (2 )-wedge dischnation in AF liquid crystals is investigated. The attraction of dislocation part of dispiration with (2 )-wedge disclination can lead to the formation of (3 )-wedge-screw dispiration. When (2 )-wedge disclination is trapped by (2d)-screw dislocation the resulting (2 , 2d)-dispiration can dissociate into a pair of two ( , d)-dispirations.The authors express their thanks to Professors A. Fukuda, H. Takezoe, Dr. Y. Takanishi and to Dr. K. Miyachi for discussions concerning their experimental observations of (3 , d)-wedge-screw dispirations and ( , d)-twist-edge dispirations in AF structures. This work was supported by the grant No. 19062 from Acad. Sci. Cz. R. and also benefited by the grant No.: 202/93/155 from the Grant Agency of the Czech Republic. |
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