Institute of Physics, University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
J Chem Phys. 2011 Jul 14;135(2):024110. doi: 10.1063/1.3605602.
Conditions towards effective electric field poling in two dimensions (2D) of octupolar molecules which can be achieved are being addressed, based on a lattice model which mimics the basic features of poling. The model is studied using the complementary approaches of analytical methods in statistical mechanics and Monte Carlo simulations. The poling field is imparted by a system of adequately shaped cylindrical electrodes. A topologically rich structure of local and global inhomogeneous octupolar order, including octupolar vortices, is present in the system. The poling criteria are shown to vary strongly throughout the cell: in close proximity to the contact points of neighboring electrodes, a high quality local octupolar order appears at temperature T ≃ 0.1 K while octupoling in the center of the cell requires temperatures as low as 10(-4) K. The highly demanding octupoling criteria are ascribed to symmetry-driven effects which decrease the quality of the octupolar phase even in the ground state, as well as to thermal fluctuations and numerical factors at above zero temperatures. Based on our results and using plausible conjectures related to the generalization of the model, it is argued that a weak global octupolar order can be reached at liquid Helium temperatures (a few Kelvins), based on current advances in optical techniques and nanotechnologies.
正在探讨在八极分子的二维（2D）中实现有效电场极化的条件，该条件基于模拟极化基本特征的晶格模型。该模型使用统计力学的分析方法和蒙特卡罗模拟的互补方法进行研究。极化场由适当形状的圆柱形电极系统施加。在系统中存在局部和全局非均匀八极有序的拓扑丰富结构，包括八极涡旋。结果表明，极化标准在整个单元中变化很大：在与相邻电极接触点附近，在温度 T ≃ 0.1 K 时会出现高质量的局部八极有序，而在单元中心的八极化则需要低至 10(-4) K 的温度。高要求的八极化标准归因于对称驱动效应，即使在基态下，这些效应也会降低八极相的质量，以及在零上温度下的热波动和数值因素。基于我们的结果，并使用与模型推广相关的合理假设，我们认为，基于当前在光学技术和纳米技术方面的进展，在氦液温度（几开尔文）下可以达到弱全局八极有序。
