Predicting a Polar Analog of Chiral Blue Phases in Liquid Crystals

被引：45

作者：

Shamid, Shaikh M. ^{[1
,2
]}

Allender, David W. ^{[1
,2
]}

Selinger, Jonathan V. ^{[1
]}

机构：

[1] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA

[2] Kent State Univ, Dept Phys, Kent, OH 44242 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 23期

基金：

美国国家科学基金会;

关键词：

BANANA-SHAPED MOLECULES;

D O I：

10.1103/PhysRevLett.113.237801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In liquid crystals, if flexoelectric couplings between polar order and director gradients are strong enough, the uniform nematic phase can become unstable to the formation of a modulated polar phase. Previous theories have predicted two types of modulation: twist bend and splay bend; the twist-bend phase has been found in recent experiments. Here, we investigate other types of modulation, using lattice simulations and Landau theory. In addition to twist bend and splay bend, we also find polar blue phases, with 2D or 3D modulations of both the director and the polar order. We compare polar blue phases with chiral blue phases, and discuss opportunities for observing them experimentally.

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