论文标题

古典磁系统中的拓扑绝缘子和半法

Topological insulators and semimetals in classical magnetic systems

论文作者

Li, Z. -X., Cao, Yunshan, Yan, Peng

论文摘要

在自然和人造材料中追求拓扑阶段是现代物理科学与工程学中的核心主题之一。在经典的磁系统中,自旋波(或镁)和磁孤子(例如域壁,涡流,天空等)代表了两种重要的激发。最近,由于它们有趣的动力学以及在设计强大的复原设备设计的有前途的应用,因此在镁和孤子晶体(或超材料)中的拓扑绝缘体和半准状态引起了人们的注意。在这里,我们概述了结构化经典磁性中拓扑阶段的当前进展。我们首先简要介绍了自旋波,并讨论了其拓扑特性,包括木厅效应,拓扑镁绝缘子和狄拉克(Weyl)镁元素半法。拓扑宏伟设备的吸引力也被突出显示。然后,我们回顾用于描述磁性晶格动力学的集体坐标方法。详细阐述了教学拓扑模型,例如Su-Schrieffer-Heeger模型和Haldane模型及其在磁孤子晶体中的表现。然后,我们通过理论上分析低维系统中的一阶拓扑绝缘阶段和呼吸晶体中的高阶拓扑状态来关注磁孤子的拓扑特性。最后,我们讨论了镁和孤子晶体中边缘状态的实验实现和检测。在综述本文之前,我们会评论挑战和未来的前景。

Pursuing topological phases in natural and artificial materials is one of the central topics in modern physical science and engineering. In classical magnetic systems, spin waves (or magnons) and magnetic solitons (such as domain wall, vortex, skyrmion, etc) represent two important excitations. Recently, the topological insulator and semimetal states in magnon- and soliton-based crystals (or metamaterials) have attracted growing attention owing to their interesting dynamics and promising applications for designing robust spintronic devices. Here, we give an overview of current progress of topological phases in structured classical magnetism. We first provide a brief introduction to spin wave, and discuss its topological properties including magnon Hall effects, topological magnon insulators, and Dirac (Weyl) magnon semimetals. Appealing proposal of topological magnonic devices is also highlighted. We then review the collective-coordinate approach for describing the dynamics of magnetic soliton lattice. Pedagogical topological models such as the Su-Schrieffer-Heeger model and the Haldane model and their manifestation in magnetic soliton crystals are elaborated. Then we focus on the topological properties of magnetic solitons, by theoretically analyzing the first-order topological insulating phases in low dimensional systems and higher-order topological states in breathing crystals. Finally, we discuss the experimental realization and detection of the edge states in both the magnonic and solitonic crystals. We remark the challenges and future prospects before concluding this article.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源