多铁性Neel型skyrmion体系中新型磁电激发的理论研究

多铁性Neel型skyrmion是一类最新发现的新颖的多铁性拓扑结构。多铁性skyrmion由于其同时体现拓扑保护和磁电耦合特性，其研究有望为自旋电子学带来革命性的推动，近几年受到了国际社会的广泛关注。本项目希望通过建立描述新型多铁性Neel型skyrmion体系的有效磁电耦合模型，研究该类体系中因动态磁电耦合作用而衍生的新量子现象。我们将基于微观和唯象两方面，综合考虑自旋、轨道、晶格以及拓扑结构等因素，研究各个因素对磁电耦合影响的相对重要性，探索适应于Neel型skyrmion的拓扑磁电耦合机制。基于建立的有效模型，通过解析和数值模拟方法，研究体系的动态磁电耦合问题，揭示其拓扑磁电激发特性，包括电磁振子激发模式和微波区域的非互易方向二色性，努力去揭示和预言一些新奇的量子现象。

Multiferroic Neel-type skyrmion is a newly discovered novel multiferroic topological spin structure. Multiferroic skyrmions, which simultaneously exhibit topological protection and magnetoelectric coupling, would have a revolutionary impact on the development of the spintronics devices, and have attracted increasing interests in recent years. In this project, we will study the new quantum effects due to the dynamical magnetoelectric coupling in the multiferroic Neel-type skyrmion based on the effective model. We firstly explore the topological magnetoelectric coupling effects in the multiferroic Neel-type skyrmion using microscopic and macroscopic techniques, and examine the role of the spin, orbit, and lattice degrees of freedom and the topological structure in the model. Using analytical and numerical means, we then explore the dynamical magnetoelectric coupling effects and clarify their topological magnetoelectric excitation, including electromagnon excitation mode and nonreciprocal directional dichroism in a microwave frequency regime. It is aim to reveal the novel properties of the magnetoelectric excitations and to predict new quantum effects in the multiferroic Neel-type skyrmions.