论文标题
Honeycomb Ferromagnets中的Magnonic Su-Schrieffer-Heeger模型
Magnonic Su-Schrieffer-Heeger Model in Honeycomb Ferromagnets
论文作者
论文摘要
拓扑电子已将其丰富度扩展到非电子系统，在该系统中，声子和镁可以发挥电子作用。特别是，可以通过Dzyaloshinskii-Moriya相互作用（DMI）来实现镁的拓扑阶段，该相互作用（DMI）是有效的自旋轨道耦合。我们表明，除了DMI之外，海森堡交换相互作用的交替布置批判性地决定了磁杆带拓扑结构，从而实现了Su-Schrieffer-Heeger模型的镁性类似物。在带有垂直各向异性的蜂窝铁磁铁上，我们通过允许在不同链接上的相对交换相互作用的相对强度来调谐，计算拓扑相图，手性边缘状态和相关的木厅效应。包括弱的声子杂交杂交不会改变结果。讨论了候选材料。
Topological electronics has extended its richness to non-electronic systems where phonons and magnons can play the role of electrons. In particular, topological phases of magnons can be enabled by the Dzyaloshinskii-Moriya interaction (DMI) which acts as an effective spin-orbit coupling. We show that besides DMI, an alternating arrangement of Heisenberg exchange interactions critically determines the magnon band topology, realizing a magnonic analog of the Su-Schrieffer-Heeger model. On a honeycomb ferromagnet with perpendicular anisotropy, we calculate the topological phase diagram, the chiral edge states, and the associated magnon Hall effect by allowing the relative strength of exchange interactions on different links to be tunable. Including weak phonon-magnon hybridization does not change the result. Candidate materials are discussed.
