Fine structures of defect cores induced by elastic anisotropy and biaxiality in hybrid alignment nematics  

作　　者：Xuan Zhou Si-Bo Chen Zhi-Dong Zhang 周璇;陈思博;张志东(Department of physics, Hebei University of Technology, Tianjin 300401, China;School of Electronic and Information Engineering, Hebei University of Technology, Tianjin 300401, China;Tianjin Key Laboratory of Electronic Materials and Devices, Tianjin 3004-01, China)

机构地区：[1]Department of physics, Hebei University of Technology, Tianjin 300401, China [2]School of Electronic and Information Engineering, Hebei University of Technology, Tianjin 300401, China [3]Tianjin Key Laboratory of Electronic Materials and Devices, Tianjin 300401, China

出　　处：《Chinese Physics B》2018年第5期412-418,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11374087 and 11447179);the Key Subject Construction Project of Hebei Province University,China

摘　　要：Based on Landau–de Gennes theory and two-dimensional finite-difference iterative method, the spontaneous distortion in hybrid alignment nematic cells with M = ±1/2 disclination lines is investigated by establishing two models. The fine structures of defect cores are described in the order space S^2/Z2. The joint action of elastic anisotropy（L2/L1） and biaxiality of defects induces the spontaneous twist distortion, accompanied by the movement of the defect center to the upper or lower plate. For each model, four mixed defect structures appear with the same energy, which are defined as energetically degenerated quadruple states.Based on Landau–de Gennes theory and two-dimensional finite-difference iterative method, the spontaneous distortion in hybrid alignment nematic cells with M = ±1/2 disclination lines is investigated by establishing two models. The fine structures of defect cores are described in the order space S^2/Z2. The joint action of elastic anisotropy（L2/L1） and biaxiality of defects induces the spontaneous twist distortion, accompanied by the movement of the defect center to the upper or lower plate. For each model, four mixed defect structures appear with the same energy, which are defined as energetically degenerated quadruple states.

关 键 词：Landau-de Gennes theory elastic anisotropy mixed defects order space 

分 类 号：O469[理学—凝聚态物理]