论文标题
单轴易于轴抗fiferromagnets中的偶极自旋波：自然拓扑结构半度
Dipolar spin waves in uniaxial easy-axis antiferromagnets: A natural topological nodal-line semimetal
论文作者
论文摘要
最近证明，磁静态表面旋转波在铁磁体中的存在，被称为达蒙 - 什叶派模式，起源于偶极 - 偶极相互作用的拓扑。在这项工作中，我们研究了具有单轴各向异性的易轴抗铁磁体中镁质的拓扑特征。发现偶极自旋波是由偶极 - 偶极相互作用驱动的，在拓扑结节线半学相中，由于体积边缘的对应关系，该相位构成了Damon-Eshbach型表面模式。偶极自旋波的长波长特征使我们的提案有效，对任何天然的单轴易于轴抗铁磁铁有效，从而丰富了拓扑镁质材料的候选物。与铁磁体中的非偏置特性相反，在每个表面上共存相反的动量的表面模式，但手势不同。这样的手性摩托明或旋转摩托蛋白锁定，类似于拓扑绝缘体中电子表面状态的锁骨，为在抗fiferromagnets中设计了新型的基于手性的宏伟磁岩设备的机会。
The existence of the magnetostatic surface spin waves in ferromagnets, known as Damon-Eshbach mode, was recently demonstrated to originate from the topology of the dipole-dipole interaction. In this work, we study the topological characteristics of magnons in easy-axis antiferromagnets with uniaxial anisotropy. The dipolar spin waves are found to be, driven by the dipole-dipole interaction, in a topological nodal-line semimetal phase, which hosts Damon-Eshbach-type surface modes due to the bulk-edge correspondence. The long wavelength character of dipolar spin waves makes our proposal valid for any natural uniaxial easy-axis antiferromagnet, and thus enriches the candidates of topological magnonic materials. In contrast to the nonreciprocal property in ferromagnetic case, the surface modes with opposite momentum coexist at each surface, but with different chiralities. Such a chirality-momentum or spin-momentum locking, similar to that of electronic surface states in topological insulators, offers the opportunity to design novel chirality-based magnonic devices in antiferromagnets.
