Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system

Jing ZHANG; Xuan ZHOU; Si-bo CHEN; Kai LIU; Zhi-dong ZHANG

doi:10.3788/YJYXS20183301.0001

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Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system

Material and Device | 更新时间：2020-07-06

- Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system
- Chinese Journal of Liquid Crystals and Displays Vol. 33, Issue 1, Pages: 1-13(2018)
- 作者机构：
  
  1.河北工业大学理学院, 天津 300401
  2.河北冀雅电子有限公司, 河北石家庄 050071
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20183301.0001
  CLC： O753.2
- Received：24 July 2017，
  
  Accepted：12 August 2017，
  
  Published：05 January 2018
- 稿件说明：
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Jing ZHANG, Xuan ZHOU, Si-bo CHEN, et al. Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system[J]. Chinese journal of liquid crystals and displays, 2018, 33(1): 1-13.
DOI：

Jing ZHANG, Xuan ZHOU, Si-bo CHEN, et al. Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system[J]. Chinese journal of liquid crystals and displays, 2018, 33(1): 1-13. DOI： 10.3788/YJYXS20183301.0001.

摘要

基于Landau-de Gennes理论，利用松弛迭代法，研究了电场诱导平行排列向列相液晶系统中的3种畴壁，以及畴壁中的挠曲电效应和自发扭曲效应。结果表明，畴壁存在的电压范围为0.2 ≤

≤ 1.2（

=1.45 V/

m）。单一常数近似下，相反方向外电场的挠曲电效应对扭曲壁中扭曲角的影响关于90°对称；对混合壁中扭曲角的影响是非对称的；对展-弯壁无影响。弹性各向异性时，外电场会诱导自发扭曲效应。该效应会使展-弯壁与混合壁中指向矢均由原角度变为90°，即沿壁切线方向排列；对扭曲壁结构无影响。挠曲电效应会在自发扭曲的基础上，对畴壁中指向矢扭曲角产生叠加影响。

Abstract

Based on Landau-de Gennes theory

we investigated the flexoelectric effect and spontaneous distortion effect within three different domain walls in parallel aligned nematic liquid crystal system influenced by electric field

using the relaxation iterative method. Our results show that

the domain walls in our system exist in the range of 0.2 ≤

≤ 1.2(

=1.45 V/

m). With one elastic constant approximation

flexoelectric effect with opposite direction of electric field will influence the twist angle of domain walls

which has 90° symmetry effect on twist wall

asymmetric effect on mixed wall

and no influence on spay-bend wall. Under the elastic anisotropy

external field will induce spontaneous distortion effect

which will change the twist angle from original angle to 90° bothin splay-bend wall and mixed wall

namely the director will reorient along the tangential direction of wall

but have no effect on twist wall. Beyond that

flexoelectric effect will have superposition impact on the director orientation in the domain wall.

关键词

Keywords

references

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