Theoretical prediction of the dielectric spectrum of an antiferroelectric liquid crystal
Theoretical prediction of the dielectric spectrum of an antiferroelectric liquid crystal
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反铁电液晶介电谱的理论预测
DOI：
10.1063/1.1486029
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发表时间：
2002
影响因子：
3.2
通讯作者：
S. Elston
中科院分区：
文献类型：
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作者：
L. Parry;S. Elston
反铁电液晶的介电谱是通过找到描述其时间依赖行为的Landau-Ginzburg方程的近似解析解来预测的。预测了两种集体模式：（i）由相邻层中的指向矢的同相旋转引起的低频模式;（ii）由反相运动引起的高频模式。同相模式的机制被证明是所施加的电场与极化的相互作用，这是由局部变化引起的反铁电有序（反相运动）。预测的介电谱的偏置场依赖性与实验结果非常一致。近似解析解用于估计螺旋解绕的临界场，结果与数值预测和de Gennes对胆甾相液晶临界解绕场的结果一致[P. De Gennes，Solid State Commun. 6，163（1968）]。
The dielectric spectrum of an antiferroelectric liquid crystal is predicted by finding approximate analytic solutions to the Landau–Ginzburg equation describing its time dependent behavior. Two collective modes are predicted: (i) a low frequency mode that is caused by an in-phase rotation of the directors in adjacent layers; (ii) a higher frequency mode caused by an antiphase motion. The mechanism for the in-phase mode is shown to be the interaction of the applied field with a polarization that is induced by a local change to the antiferroelectric ordering (an antiphase motion). The bias field dependencies of the predicted dielectric spectrum are shown to agree well with experimental results. The approximate analytic solutions are used to estimate the critical field for helix unwinding, the result being consistent with numerical predictions and de Gennes’ result for the critical unwinding field of a cholesteric liquid crystal [P. De Gennes, Solid State Commun. 6, 163 (1968)].
Y. Ouchi、H. Takezoe 和 A. Fukuda：铁电体。
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