Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets

Chengwang Niu (), Jan-Philipp Hanke, Patrick M. Buhl, Hongbin Zhang, Lukasz Plucinski, Daniel Wortmann, Stefan Blügel, Gustav Bihlmayer and Yuriy Mokrousov
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Chengwang Niu: Shandong University
Jan-Philipp Hanke: Forschungszentrum Jülich and JARA
Patrick M. Buhl: Forschungszentrum Jülich and JARA
Hongbin Zhang: Technische Universität Darmstadt
Lukasz Plucinski: Forschungszentrum Jülich and JARA
Daniel Wortmann: Forschungszentrum Jülich and JARA
Stefan Blügel: Forschungszentrum Jülich and JARA
Gustav Bihlmayer: Forschungszentrum Jülich and JARA
Yuriy Mokrousov: Forschungszentrum Jülich and JARA

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract 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.

Date: 2019
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DOI: 10.1038/s41467-019-10930-6

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