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arXiv 0906.1005cond-mat.soft
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蓝相的数值结果

Numerical Results for the Blue Phases

G. P. Alexander, J. M. Yeomans

摘要:

我们回顾了最近的数值工作调查的平衡相图,和动态,的蓝相。在平衡的数值结果证实了经典的分析理论的预测,并将它们扩展到包括不同的弹性常数值,或施加的电场的影响。有一个显着增加的稳定性蓝相I在系统中,螺旋发生反转,并在此阶段观察到的异常电致伸缩再现。求解运动方程,使我们能够提出的相变动力学的蓝色相I下的电介质或flexoelectric耦合到一个应用的电场的结果。我们还提出了在流场中的蓝相模拟,显示如何的向错网络的行为,以反对流。这些结果是基于液晶自由能的朗道-德热内(Landau-de Gennes)解释:如此简单而优雅的理论能够预测如此复杂而微妙的物理行为,这是非常了不起的。

英文摘要:

We review recent numerical work investigating the equilibrium phase diagram, and the dynamics, of the cholesteric blue phases. In equilibrium numerical results confirm the predictions of the classic analytical theories, and extend them to incorporate different values of the elastic constants, or the effects of an applied electric field. There is a striking increase in the stability of blue phase I in systems where the cholesteric undergoes helical sense inversion, and the anomalous electrostriction observed in this phase is reproduced. Solving the equations of motion allows us to present results for the phase transition kinetics of blue phase I under dielectric or flexoelectric coupling to an applied electric field. We also present simulations of the blue phases in a flow field, showing how the disclination network acts to oppose the flow. The results are based on the Landau-de Gennes exapnsion of the liquid crystal free energy: that such a simple and elegant theory can predict such complex and subtle physical behaviour is remarkable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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