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arXiv 2209.09435cond-mat.mes-hall
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通过边界手性注入实现磁振子拓扑的电子调控

Electronic Manipulation of Magnon Topology by Chirality Injection from Boundaries

Seunghun Lee, Gyungchoon Go, Se Kwon Kim

AI总结:

本研究提出通过边界自旋手性注入的电子操作调控磁振子拓扑相的方案,突破传统体调控的限制,验证了其在铁磁及反铁磁蜂窝晶格中的有效性,并提出热霍尔电导率肩峰作为实验探测标志。

摘要:

已知在合适条件下,有序磁体中的磁振子能带可呈现非平凡拓扑,产生被称为磁振子拓扑绝缘体的拓扑相。驱动磁振子拓扑相变的传统方法是体磁操作或热操作,例如改变外磁场方向或改变系统温度,这类方法在磁振子拓扑的器件应用中并不理想。在本研究中,我们提出了一种通过自旋手性注入的电子边界操作来调控磁振子拓扑相的方案,突破了磁振子拓扑调控依赖体非电子操作的限制。更具体地说,我们研究了铁磁蜂窝晶格,并证明通过自旋霍尔效应从系统边界注入的有限自旋手性,会为陈绝缘体Haldane模型的玻色子对应物引入可调控的子晶格对称性破缺质量项,从而使我们能够从边界以电子方式调控磁振子的体拓扑。我们提出将热霍尔电导率曲线中的“肩峰”作为手性诱导拓扑相变的实验探测手段。研究表明,这种磁振子拓扑边界调控方案也适用于蜂窝反铁磁体。我们设想,界面手性注入可为调控一般磁性系统的静态和动态体性质提供一种非侵入式的电子手段。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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