Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets
Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets
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DOI：
10.1038/s41467-019-10930-6
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发表时间：
2018-05
影响因子：
16.6
通讯作者：
C. Niu;Jan-Philipp Hanke;P. M. Buhl;Hongbin Zhang;L. Plucinski;D. Wortmann;S. Blügel;G. Bihlmayer;Y. Mokrousov
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文献类型：
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作者：
C. Niu;Jan-Philipp Hanke;P. M. Buhl;Hongbin Zhang;L. Plucinski;D. Wortmann;S. Blügel;G. Bihlmayer;Y. Mokrousov
外尔费米子和拓扑半金属的概念出现在三维动量空间被广泛探讨，由于各种各样的奇异性质，他们给了。另一方面，人们对二维磁性材料中出现的半金属态知之甚少，而这是目前和未来信息技术的基础。在这里，我们证明，包括磁化方向到拓扑分析允许拓扑半金属状态，表现在二维铁磁体作为自旋轨道和交换相互作用之间的相互作用的结果的自然分类。我们探讨了这种混合拓扑半金属在现实材料中的出现和稳定性，并指出了混合拓扑状态的电流诱导轨道磁性和电流诱导畴壁运动的前景。我们的发现为理解、设计和利用二维自旋轨道铁磁体中的拓扑半金属态铺平了道路。
The concepts of Weyl fermions and topological semimetals emerging in three-dimensional momentum space are extensively explored owing to the vast variety of exotic properties that they give rise to. On the other hand, very little is known about semimetallic states emerging in two-dimensional magnetic materials, which present the foundation for both present and future information technology. Here, we demonstrate that including the magnetization direction into the topological analysis allows for a natural classification of topological semimetallic states that manifest in two-dimensional ferromagnets as a result of the interplay between spin-orbit and exchange interactions. We explore the emergence and stability of such mixed topological semimetals in realistic materials, and point out the perspectives of mixed topological states for current-induced orbital magnetism and current-induced domain wall motion. Our findings pave the way to understanding, engineering and utilizing topological semimetallic states in two-dimensional spin-orbit ferromagnets.