Theory of the splay nematic phase: Single versus double splay.
Theory of the splay nematic phase: Single versus double splay.
复制标题
展开向列相理论：单展开与双展开。
DOI：
10.1103/physreve.101.052707
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Jonathan V Selinger
中科院分区：
文献类型：
--
作者：
M. Rosseto;Jonathan V Selinger
最近的实验报道了一种新的展曲相位，其具有正展曲和负展曲的交替域。为了模拟这个阶段，以前的研究已经考虑了一个一维（1D）张开调制的导演场，伴随着一个1D调制的极性顺序。当展曲和极序之间的挠曲电耦合变得足够强时，均匀的电致伸缩状态变得不稳定以形成调制相位。在这里，我们重新审视这一理论在最近的液晶弹性，这表明，纯展曲变形是双展曲，而不是平面单展曲的方法。根据这一推理，我们提出了一种结构与二维（2D）的展弦调制的导演场，伴随着2D调制的极序，并表明，2D结构一般具有较低的自由能比1D结构。
Recent experiments have reported a novel splay nematic phase, which has alternating domains of positive and negative splay. To model this phase, previous studies have considered a one-dimensional (1D) splay modulation of the director field, accompanied by a 1D modulation of polar order. When the flexoelectric coupling between splay and polar order becomes sufficiently strong, the uniform nematic state becomes unstable to the formation of a modulated phase. Here we reexamine this theory in terms of a recent approach to liquid crystal elasticity, which shows that pure splay deformation is double splay rather than planar single splay. Following that reasoning, we propose a structure with a two-dimensional (2D) splay modulation of the director field, accompanied by a 2D modulation of polar order, and show that the 2D structure generally has a lower free energy than the 1D structure.
影响因子：
44.1
作者：
Jakli, Antal;Lavrentovich, Oleg D.;Selinger, Jonathan V.
通讯作者：
Selinger, Jonathan V.