各向异性烧绿石铁磁体中的磁振子谱线半金属和鼓膜表面态
Magnon nodal-line semimetals and drumhead surface states in anisotropic pyrochlore ferromagnets
摘要：
介绍了一种新型的拓扑磁振子物质：电子线半金属的磁振子悬挂。各向异性烧绿石铁磁体的磁振子谱具有沿倒易空间闭合环的磁振子带的双重简并。这些磁振子节线在拓扑上受到反转和时间反转对称共存的保护;它们需要不存在自旋-轨道相互作用（没有Dzyaloshinskiiii-Moriya相互作用）。我们计算的拓扑不变量的节线和相关的磁振子鼓面表面状态的细节强烈依赖于终止的表面。磁振子线半金属完成了三维铁磁材料中拓扑磁振子家族。
英文摘要：
We introduce a new type of topological magnon matter: the magnonic pendant to electronic nodal-line semimetals. Magnon spectra of anisotropic pyrochlore ferromagnets feature twofold degeneracies of magnon bands along a closed loop in reciprocal space. These magnon nodal lines are topologically protected by the coexistence of inversion and time-reversal symmetry; they require the absence of spin-orbit interaction (no Dzyaloshinskii-Moriya interaction). We calculate the topological invariants of the nodal lines and show that details of the associated magnon drumhead surface states depend strongly on the termination of the surface. Magnon nodal-line semimetals complete the family of topological magnons in three-dimensional ferromagnetic materials.
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