Monte Carlo simulations of biaxial structure in thin hybrid nematic film based upon spatially anisotropic pair potential  

作　　者：张志东 常春蕊 马东来 

机构地区：[1]Department of Physics, Hebei University of Technology

出　　处：《Chinese Physics B》2009年第4期1560-1563,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grants Nos 60736042 and 60878047);the Key Subject Construction Project of Hebei Province University

摘　　要：Hybrid nematic films have been studied by Monte Carlo simulations using a lattice spin model, in which the pair potential is spatially anisotropic and dependent on elastic constants of liquid crystals. We confirm in the thin hybrid nematic film the existence of a biaxially nonbent structure and the structure transition from the biaxial to the bent-director structure, which is similar to the result obtained using the Lebwoh-Lasher model. However, the step-like director＇s profile, characteristic for the biaxial structure, is spatially asymmetric in the film because the pair potential leads to K1 ≠ K3. We estimate the upper cell thickness to be 69 spin layers, in which the biaxial structure can be found.Hybrid nematic films have been studied by Monte Carlo simulations using a lattice spin model, in which the pair potential is spatially anisotropic and dependent on elastic constants of liquid crystals. We confirm in the thin hybrid nematic film the existence of a biaxially nonbent structure and the structure transition from the biaxial to the bent-director structure, which is similar to the result obtained using the Lebwoh-Lasher model. However, the step-like director＇s profile, characteristic for the biaxial structure, is spatially asymmetric in the film because the pair potential leads to K1 ≠ K3. We estimate the upper cell thickness to be 69 spin layers, in which the biaxial structure can be found.

关 键 词：hybrid nematic film biaxial structure spatially anisotropic pair potential Monte Carlo simulation 

分 类 号：O484.1[理学—固体物理] O242.2[理学—物理]