具有实空间拓扑铁电涡旋畴结构是当前凝聚态物理领域的前沿增长点，蕴含丰富物理现象和潜在应用前景。本项目以六角晶系锰氧化物RMnO3薄膜的拓扑畴结构及其新颖光电磁效应为研究对象，实验与理论相结合。一方面，外延生长具有拓扑铁电涡旋畴的几类六角晶系RMnO3薄膜，探索晶格失配、应力、界面态与缺陷等因素对拓扑铁电涡旋畴结构和极化、磁性、电导、磁电耦合性能的影响，发展拓扑正-反涡旋畴反转、拓扑畴运动及畴密度大小的调控方法。同时，探讨拓扑铁电涡旋畴潜在的新颖特性，如光伏特性。另一方面，通过第一性原理和唯像相场方法研究拓扑畴壁的电子结构与热力学稳定性，揭示拓扑畴结构及其动力学行为，结合实验结果，阐明拓扑结构与铁电、磁性及磁电耦合等性能的关系。本项目的研究将丰富实空间拓扑铁电涡旋畴的物理内涵，拓展凝聚态物理学中拓扑性范畴，为拓扑涡旋电畴在信息存储与能源等领域的应用提供物理基础。

Real space topological vortex is the cutting-edge frontier of growth in the modern condensed matter physics, which own nontrivial physics and broad potential applications. In this project, we propose to study the real space topological vortex and their novel photoelectricmagnetic phenomena of hexagonal manganite RMnO3 (R: transition metal) epitaxial films by combining the experiment and theory. On the one hand, we will fabricate some hexagonal RMnO3 epitaxial films with the topological vortex to explore the influence of stress, interface states and defects in the films on the topological vortex, polarization, magnetic, conductive and magnetoelectric coupling properties and develop the method for modulating the topological vortex and anti-vortex，movement and the size of the topological vortex. Furthermore, some underlying phenomena, e.g., photovoltaic properties, will be investigated under the external conditions, such as electric and magnetic fields, light. On the other hand, electronic structure and thermodynamic stability of topological vortex domain will be studied and the topological vortex structures and their dynamic behavior will be by using the first principles and phenomenological phase field model to illustrate the relationship between topological structure and ferroelectric, magnetic and magnetoelectric coupling properties in hexagonal RMnO3 system. Our project will enrich the physical mechanism of the real space topological vortex and extend the field in condensed matter physics, and push forward the physical fundament for the application of topological vortex in the field of information storage and energy.