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arXiv 2501.00516cond-mat.soft
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厚层液晶胆甾相壳

Thick liquid crystalline cholesteric shells

Arda Bulut, Yusuf Sariyar, Giuseppe Negro, Livio Nicola Carenza

AI总结:

本文数值研究厚层胆甾相液晶壳的相行为,揭示厚度和手性对缺陷构型与蓝相转变的调控,并利用亚稳态实现弹性诱导的表面重排。

摘要:

我们数值研究了在壳边界具有切向锚定的胆甾相液晶厚壳的相行为。对于非手性液晶,我们展示了一种依赖于厚度的转变:从具有四条连接内外表面的向错线的构型,转变到体相中无缺陷的状态,其中每个表面在拓扑上被隔离并具有两个 boojum。引入手性可以稳定新的缺陷排列,包括结合 boojum 和向错线的混合态,以及在高手性下的蓝相,并且我们证明壳厚度强烈调制这些转变。最后,我们利用所观察相态的亚稳特性,在胆甾相滞后循环期间获得壳表面的弹性诱导重排,从而稳定一种在低手性下使自由能最小化的替代构型。我们的工作为探索外场、混合锚定条件或活性流下的动态行为铺平了道路。

英文摘要:

We numerically investigate the phase behavior of thick shells of cholesteric liquid crystals with tangential anchoring at the shell boundary. For achiral liquid crystal, we demonstrate a thickness-dependent transition from a configuration featuring four disclination line connecting the inner and outer surfaces to a state free of defect in the bulk, where each surface is topologically isolated and features two boojums. Incorporating chirality stabilizes novel defect arrangements, including a mixed state combining boojums and disclination lines and blue phases at high chirality and we demonstrate that shell thickness strongly modulates these transitions. Finally, we exploit the metastability features of the observed phases to obtain an elastically induced rearrangement of the shell surfaces during a cholesteric hysteresis cycle, stabilizing an alternative configuration that minimizes the free energy at low chirality. Our work paves the way for exploring dynamic behaviors under external fields, mixed anchoring conditions, or active flows.

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