自支撑近晶薄膜的场致层减薄相变
Field-induced layer thinning transition on free-standing smectic films
摘要：
当温度升高到近晶-各向同性体转变温度以上时，强锚定的自支撑近晶薄膜通常呈现层数的逐步减少。在这里，我们证明了场致层变薄过渡可以发生在近晶膜具有负介电各向异性，甚至低于体转变温度。使用一个扩展的麦克米伦模型，我们提供了这种分层过渡的相图，并表明，当该领域是提高以上的散装过渡领域，薄膜厚度的减少是很好地描述了一个幂律的指数，取决于温度和纵横比的液晶分子。
英文摘要：
Strongly anchored free-standing smectic films usually present a stepwise reduction of the number of layers when the temperature is raised above the smectic-isotropic bulk transition temperature. Here, we demonstrate that a field-induced layer thinning transition can take place in smectic films with a negative dielectric anisotropy even below the bulk transition temperature. Using an extended McMillan's model, we provide the phase diagram of this layering transition and show that, when the field is raised above the bulk transition field, the film thickness reduction is well described by a power-law with an exponent that depends on the temperature and the aspect ratio of the liquid crystal molecule.
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