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首页> 外文期刊>SIAM Journal on Mathematical Analysis >Magnetic field-induced instabilities in liquid crystals
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Magnetic field-induced instabilities in liquid crystals

机译:液晶中磁场引起的不稳定性

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We use the Landau-de Gennes model to investigate the magnetic field-induced instabilities in liquid crystals. In particular, we examine the change of weak and strong stabilities in the pure smectic states and in the pure nematic states. Motivated by de Gennes' discovery on the analogies between liquid crystals and superconductors, we introduce critical magnetic fields Hs and H-sh. The pure smectic states lose their global minimality (strong stability) at H-s and lose their local minimality ( weak stability) at Hsh. We also examine the change of stability in the pure nematic states. We show in the case of equal elastic coefficients that a liquid crystal in a sufficiently strong magnetic field will not be in a pure nematic state, which exhibits a significant difference between the Landau-de Gennes model for liquid crystals and the Ginzburg-Landau model for superconductivity.
机译:我们使用Landau-de Gennes模型研究液晶中磁场引起的不稳定性。特别是,我们研究了纯近晶态和纯向列态中弱稳定性和强稳定性的变化。出于de Gennes关于液晶和超导体之间类比的发现的启发,我们引入了临界磁场Hs和H-sh。纯近晶态在H-s处失去其整体极小值(强稳定性),在Hsh处失去其局部极小值(弱稳定性)。我们还研究了纯向列态的稳定性变化。我们证明,在弹性系数相等的情况下,在足够强的磁场中液晶将不会处于纯向列状态,这在液晶的Landau-de Gennes模型与用于磁场的Ginzburg-Landau模型之间显示出显着差异。超导。

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