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arXiv 1009.4402math.AP
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Landau-de Gennes理论中的径向Hedgehog解

The Radial-Hedgehog Solution in Landau--de Gennes' theory

Apala Majumdar

摘要:

在Landau-de Gennes理论下,研究了具有垂面边界条件的三维球形液滴中的径向刺猬解。径向刺猬解决方案是一个全球稳定的配置在这个模型框架的候选人,也是一个原型配置研究孤立点缺陷在凝聚态物理。径向刺猬解的静态性质由一个非线性奇异常微分方程控制。我们分别考虑两个不同的极限-\emph{vanishing core limit}和\emph{low-temperature limit}。我们使用Ginzburg-Landau技术,扰动法和稳定性分析的组合来研究径向刺猬解决方案的定性性质,无论是在附近和远离缺陷的核心。我们建立的不稳定性的径向刺猬解决方案相对于双轴扰动在某些参数制度,并证明在其他参数制度的径向刺猬解决方案的稳定性。我们的研究结果补充了以前的工作在该领域中,是严格的性质,并提供有关的径向刺猬解决方案和相关的双轴不稳定性的性质的几何形状和温度的作用的信息。

英文摘要:

We study the radial-hedgehog solution in a three-dimensional spherical droplet, with homeotropic boundary conditions, within the Landau-de Gennes theory for nematic liquid crystals. The radial-hedgehog solution is a candidate for a globally stable configuration in this model framework and is also a prototype configuration for studying isolated point defects in condensed matter physics. The static properties of the radial-hedgehog solution are governed by a nonlinear singular ordinary differential equation. We consider two different limits separately - the \emph{vanishing core limit} and \emph{low-temperature limit} respectively. We use a combination of Ginzburg-Landau techniques, perturbation methods and stability analysis to study the qualitative properties of the radial-hedgehog solution, both in the vicinity of and away from the defect core. We establish the instability of the radial-hedgehog solution with respect to biaxial perturbations in certain parameter regimes and demonstrate the stability of the radial-hedgehog solution in other parameter regimes. Our results complement previous work in the field, are rigorous in nature and give information about the role of geometry and temperature on the properties of the radial-hedgehog solution and the associated biaxial instabilities.

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