论文标题
双轴何时晶状体气体模型的相位行为
Phase behavior of a lattice-gas model for biaxial nematics
论文作者
论文摘要
我们采用具有离散取向状态的maier-saupe模型的晶格 - 气体扩展，以研究平均场理论中双轴神经性单位的统计模型的相位行为。根据各向异性对象之间的各向同性相互作用的强度，双轴性程度和这些单位的浓度，研究了系统的相行为。我们获得了各向同性阶段以及稳定的双轴和单轴列表结构，各种相共存，多种类型的关键和多政治行为，例如普通的蒸气临界点，临界点和三明点，以及不同的类似Landau类的多政治临界点。我们的结果扩大了将Landau-de Gennes扩展到微观参数的现象学系数的可能性，从而可以改善对理论配件的解释与实验数据。
We employ a lattice-gas extension of the Maier--Saupe model with discrete orientation states to study the phase behavior of a statistical model for biaxial nematogenic units in mean-field theory. The phase behavior of the system is investigated in terms of the strength of isotropic interaction between anisotropic objects, as well as the degree of biaxiality and the concentration of those units. We obtain phase diagrams with isotropic phases and stable biaxial and uniaxial nematic structures, various phase coexistences, many types of critical and multicritical behaviors, such as ordinary vapor-liquid critical points, critical end points and tricritical points, and distinct Landau-like multicritical points. Our results widen the possibilities of relating the phenomenological coefficients of the Landau--de Gennes expansion to microscopic parameters, allowing an improved interpretation of theoretical fittings to experimental data.
