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Topological responses from gapped Weyl points in 2D altermagnets
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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.
Forward citations
Cited by 2 Pith papers
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Catalog of Altermagnetism in Magnetic Wallpaper/Space Groups and Nonsymmorphic Altermagnets
Complete catalog finds 17 altermagnetic wallpaper groups and 422 space groups (including 262 non-centrosymmetric) and identifies nonsymmorphic hourglass spin-splitting patterns beyond the six established wave types.
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Symmetry, microscopy and spectroscopy signatures of altermagnetism
A review of the symmetry, microscopic origin, and detection of altermagnetism, a collinear magnetic phase with alternating spin polarization in momentum space.
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