ABSTRACT

As a class of typical topological structures, polarisation vortexes were characterised by the intensity vector which is defined as the curl of the polarisation at their cores. Some phase field simulations were conducted on the lead titanate nanofilms to evaluate the effects of model size, temperature, traction, and curled electric field on the formation and evolution of polarisation vortex intensity quantitatively. The results showed that increasing size, lowered temperature and increasing traction could enhance the polarisation vortex intensity, curled electric field could change the vortex rotation direction, and compressive or tensile traction could change the vortex shape. Therefore, the polarisation vortex could be tuned by the given conditions of model size, temperature, traction, and curled electric field. This is helpful to improve the understanding and control of polarisation vortex structure.

摘要

作为一类典型的拓扑结构，极化旋涡的特征在于强度矢量，该强度矢量定义为在其核心处的极化卷曲。在钛酸铅纳米薄膜上进行了一些相场模拟，以定量评估模型尺寸，温度，牵引力和卷曲电场对极化涡流强度形成和演化的影响。结果表明，增大尺寸，降低温度和增加牵引力可以增强极化涡旋强度，卷曲电场可以改变涡旋旋转方向，而压缩或拉伸牵引力可以改变涡旋形状。因此，可以通过模型尺寸，温度，牵引力和卷曲电场的给定条件来调整极化涡。