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

Area of Science:

• Condensed matter physics
• Materials science
• Spintronics

Background:

• Topological semimetals and Weyl fermions are well-studied in 3D momentum space.
• Semimetallic states in 2D magnetic materials are crucial for information technology but less understood.

Purpose of the Study:

• To classify topological semimetallic states in 2D ferromagnets.
• To explore the emergence and stability of these states in realistic materials.
• To highlight potential applications in current-induced phenomena.

Main Methods:

• Topological analysis incorporating magnetization direction.
• Investigation of spin-orbit and exchange interactions.
• Material-specific exploration of topological semimetal properties.

Main Results:

• A natural classification of topological semimetallic states in 2D ferromagnets is established.
• The interplay of spin-orbit and exchange interactions is shown to be key.
• Emergence and stability of mixed topological semimetals are demonstrated.

Conclusions:

• The findings provide a framework for understanding and engineering topological semimetallic states in 2D materials.
• Potential applications include current-induced orbital magnetism and domain wall motion.
• This work opens new avenues for utilizing 2D spin-orbit ferromagnets.