Nematic twist--bend is the fifth nematic phase recognized in nature. Thisphase exhibits spiral orientational order, thus it is a chiral structure and itcan be stabilized in systems composed of achiral molecules. The microscopicorigin of this spontaneous chiral symmetry breaking is to a large extentunknown but phenomenologically it appears stabilized by assuming couplingbetween steric polar and orientational orderings. Understanding of how externalfields affect the stability of this phase is of great intellectual interest andof relevance to potential applications. Within mesoscopic Landau--de Gennestheory we find that for compounds with positive anisotropy the helix unwinds toa polar uniaxial nematic, however negative material anisotropy gives rise to arich sequence of new nematic phases obtained via mechanism of flattening theconical spiral.
展开▼
机译：旨在的扭曲 - 弯曲是本质上识别的第五个旨在的阶段。这是呈螺旋定义顺序，因此它是一种手性结构，ITCAN在由甲状腺分子组成的系统中稳定。这种自发性手性对称性断裂的微观毒素是大的叠加，但是通过假设耦合偶联极性和方位排序来稳定这稳定。理解Efferferfields如何影响该阶段的稳定性是与潜在应用的巨大智力兴趣。在Mesoscopic Landau - De Gennestheory中，我们发现，对于具有阳性各向异性的化合物，螺旋向上展示TOA极性单轴向列，但是负面材料各向异性导致通过扁平螺旋的机制获得的新向量阶段的AriCh序列。
展开▼
