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arXiv · 2403.09520

Topological responses from gapped Weyl points in 2D altermagnets

Kirill Parshukov·Raymond Wiedmann·Andreas P. Schnyder
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Abstract

We study the symmetry requirements for topologically protected spin-polarized Weyl points in 2D altermagnets. The topology is characterized by a quantized $\pi$-Berry phase and the degeneracy is protected by spin-space group symmetries. Gapped phases with finite Chern and/or spin/chirality Chern numbers emerge under different symmetry-breaking mass terms. We investigate the surface and transport properties of these gapped phases using representative electronic tight-binding and magnonic linear spin-wave models. In particular, we calculate the electronic and magnonic Hall currents and discuss implications for experiments.

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Kirill Parshukov, Raymond Wiedmann, Andreas P. Schnyder. 2024-03-14. Topological responses from gapped Weyl points in 2D altermagnets. https://doi.org/10.1103/physrevb.111.224406

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