Thin film liquid crystals with oblique anchoring and boojums

Thin film liquid crystals with oblique anchoring and boojums
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具有倾斜锚定和 boojums 的薄膜液晶

DOI:
10.1016/j.anihpc.2020.02.002
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发表时间:
2020
期刊:
Analyse non linéaire
影响因子:
--
通讯作者:
Golovaty, Dmitry
Golovaty, Dmitry
中科院分区:
--
文献类型:
--
作者:
Alama, Stan;Bronsard, Lia;Golovaty, Dmitry

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本文研究了液晶的Landau-de Gennes能量的薄膜极限的二维变分问题。我们通过边界惩罚(弱锚定)对边界上的指向矢施加斜角条件。我们表明,对于强锚定强度(相对于通常的金斯堡-朗道长度尺度参数),缺陷将发生在内部,在强(狄利克雷)锚定的情况下,但对于较弱的锚定强度的所有缺陷将发生在边界上。这些缺陷将各自携带分数绕组数;这样的边界缺陷被称为“boojums”。boojums将沿着边界沿着有序成对出现;对于角度α∈(0,π 2),它们用于以2α和(2 π− 2 α)的步长减少相位的缠绕,以避免内部缺陷的形成。我们通过重整化能量和数值模拟确定了缺陷的数量和位置。
We study a two-dimensional variational problem which arises as a thin-film limit of the Landau-de Gennes energy of nematic liquid crystals. We impose an oblique angle condition for the nematic director on the boundary, via boundary penalization (weak anchoring.) We show that for strong anchoring strength (relative to the usual Ginzburg-Landau length scale parameter), defects will occur in the interior, as in the case of strong (Dirichlet) anchoring, but for weaker anchoring strength all defects will occur on the boundary. These defects will each carry a fractional winding number; such boundary defects are known as “boojums”. The boojums will occur in ordered pairs along the boundary; for angle α∈(0, π 2), they serve to reduce the winding of the phase by steps of 2α and (2 π− 2 α) in order to avoid the formation of interior defects. We determine the number and location of the defects via a Renormalized Energy and numerical simulations.
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