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Domain walls in vertically vibrated monolayers of cylinders confined in annuli
Physical Review Research Pub Date : 2020-09-17 , DOI: 10.1103/physrevresearch.2.033436
Ariel Díaz-De Armas , Martín Maza-Cuello , Yuri Martínez-Ratón , Enrique Velasco

Liquid-crystalline ordering in vertically vibrated granular monolayers of metallic rods confined in annuli of different sizes is examined. The annuli consist of circular cavities with a central circular obstruction. In the absence of the central obstruction, rods of low aspect ratio exhibit global tetratic order, except for the existence of four small defected regions which restore the tetratic symmetry broken by the circular confinement. However, very different configurations are observed in the annuli, with a complex structure consisting of alternating layered regions separated by tetratic domain walls. We use concepts of equilibrium elastic theory for liquid crystals and topology along with arguments based on dissipation mechanisms to qualitatively explain this behavior. The results show that selective confinement of vertically vibrated monolayers of rods could be used as a tool to study the creation and dynamics of various types of defects in ordered systems.

中文翻译:

限制在环形空间内的圆柱体的垂直振动单层畴壁

检查了在尺寸不同的环形空间内限制的金属棒的垂直振动颗粒单层中的液晶排序。环由具有中央圆形阻塞物的圆形空腔组成。在没有中央障碍物的情况下,低纵横比的棒表现出整体四次序,除了存在四个小的缺陷区域,这些缺陷区域恢复了由圆形约束破坏的四次对称性。然而,在瓣环中观察到非常不同的构型,其复杂结构由交替的分层区域组成,这些分层区域被四方畴壁隔开。我们将液晶和拓扑结构的平衡弹性理论的概念与基于耗散机制的论点一起使用,以定性地解释这种行为。
更新日期:2020-09-18
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