液晶与显示2018，Vol.33Issue(1)：1-13,13.DOI:10.3788/YJYXS20183301.0001
向列相液晶畴壁中挠曲电效应和自发扭曲效应的理论研究
Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system
摘要
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 ≤ E/E0 ≤ 1.2(E0 = 1.45 V /μm).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° both in 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
Landau-Gennes理论/畴壁/弹性各向异性/挠曲电效应/自发扭曲效应Key words
Landau-de Gennes theory/domain walls/elastic anisotropy/flexoelectric effect/sponta-neous distortion effect分类
数理科学引用本文复制引用
张晶,周璇,陈思博,刘凯,张志东..向列相液晶畴壁中挠曲电效应和自发扭曲效应的理论研究[J].液晶与显示,2018,33(1):1-13,13.基金项目
国家自然科学基金(No.11374087) Supported by the Natural Science Foundation of China (No.11374087) （No.11374087）
