论文标题
通过手性注射磁拓制的电子操纵从边界注射
Electronic Manipulation of Magnon Topology by Chirality Injection from Boundaries
论文作者
论文摘要
已知镁带在合适的条件下以有序的磁体表现出非平凡的拓扑结构，从而引起拓扑阶段，称为Magnonic拓扑绝缘子。驱动宏观拓扑相变的常规方法是批量磁性或热作战，例如改变外部磁场的方向或改变系统温度，而在木拓拓扑的设备应用中不需要。在这项工作中，我们提出了一种通过自旋手性注射的电子边界操作来操纵磁性拓扑相的方案，从而提高了巨大拓扑控制对大量非电子操纵的局限性。 More specifically, we consider a ferromagnetic honeycomb lattice and show that a finite spin chirality injected from the boundary of the system via the spin Hall effects introduces a tunable sublattice-symmetry-breaking mass term to the bosonic counterpart of the Haldane model for the Chern insulators and thereby allows us to electronically manipulate the bulk topology of magnons from the boundary.提出了热门电导率曲线中的“肩膀”作为手性诱导的拓扑相变的实验探针。磁拓制的边界操纵方案也显示为蜂窝状抗fiferromagnet。我们设想，界面性手性注射可能会提供非感染的电子手段来调整一般磁系统的静态和动力学体积。
Magnon bands are known to exhibit nontrivial topology in ordered magnets under suitable conditions, engendering topological phases referred to as magnonic topological insulators. Conventional methods to drive a magnonic topological phase transition are bulk magnetic or thermal operations such as changing the direction of an external magnetic field or varying the temperature of the system, which are undesired in device applications of magnon topology. In this work, we lift the limitation of the magnon topology control on the bulk non-electronic manipulation by proposing a scheme to manipulate magnonic topological phases by electronic boundary operations of spin chirality injection. More specifically, we consider a ferromagnetic honeycomb lattice and show that a finite spin chirality injected from the boundary of the system via the spin Hall effects introduces a tunable sublattice-symmetry-breaking mass term to the bosonic counterpart of the Haldane model for the Chern insulators and thereby allows us to electronically manipulate the bulk topology of magnons from the boundary. The "shoulder" in the thermal Hall conductivity profile is proposed as an experimental probe of the chirality-induced topological phase transition. The scheme for the boundary manipulation of the magnon topology is shown to work for a honeycomb antiferromagnet as well. We envisage that the interfacial chirality injection may offer a nonintrusive electronic means to tune the static and the dynamical bulk properties of general magnetic systems.
