Topological spin waves in the atomic-scale magnetic skyrmion crystal
Topological spin waves in the atomic-scale magnetic skyrmion crystal
复制标题
DOI：
10.1088/1367-2630/18/4/045015
复制
发表时间：
2015-11
影响因子：
3.3
通讯作者：
A. Roldán-Molina;A. Roldán-Molina;A. S. Nunez;J. Fernández-Rossier
中科院分区：
文献类型：
--
作者：
A. Roldán-Molina;A. Roldán-Molina;A. S. Nunez;J. Fernández-Rossier
我们研究了二维自旋晶格模型中由于海森堡交换、Dzyalonshinkii-Moriya相互作用、Zeeman耦合和单轴各向异性之间的竞争而产生的三角形skyrmion晶体的自旋波。计算的自旋波带具有有限的贝里曲率，在某些情况下，导致非零陈恩数，使该系统在拓扑上与传统的磁子系统不同。我们计算了边缘自旋波，从体边界对应原理中得到，并证明了它们是手性的，这使得它们不受弹性后向散射的影响。我们的研究结果说明了拓扑相是如何在中尺度自生涌现超晶格中发生的。
We study the spin waves of the triangular skyrmion crystal that emerges in a two-dimensional spin lattice model as a result of the competition between Heisenberg exchange, Dzyalonshinkii–Moriya interactions, Zeeman coupling and uniaxial anisotropy. The calculated spin wave bands have a finite Berry curvature that, in some cases, leads to non-zero Chern numbers, making this system topologically distinct from conventional magnonic systems. We compute the edge spin-waves, expected from the bulk-boundary correspondence principle, and show that they are chiral, which makes them immune to elastic backscattering. Our results illustrate how topological phases can occur in self-generated emergent superlattices at the mesoscale.