A vacancy generically induces anisotropic magnetization textures in altermagnets whose multipolar form factor encodes the altermagnetic order, visible in classical systems under transverse field and in quantum systems at zero field.
Spin-split magnon bands induce pure spin current in insulating altermagnets
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abstract
Altermagnets offer a promising platform for dissipationless spin transport by combining zero net magnetization with spontaneous non-relativistic spin splitting. However, their magnonic transport properties remain largely unexplored. Here, we develop a quantum-kinetic theory for thermally driven magnon currents that cleanly separates Berry-curvature-driven intrinsic contributions from Drude-like scattering-dependent terms. Applying this framework to a collinear honeycomb antiferromagnet with anisotropic next-nearest-neighbor exchange and Dzyaloshinskii-Moriya interaction, we reveal spin-split magnon bands that support both intrinsic and extrinsic spin Nernst and Seebeck currents. For realistic parameters, we predict a sizable magnon spin-splitting angle (about 3.3 degrees) and a pure transverse spin current capable of exerting a strong spin-splitter torque suitable for magnetization switching.
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Anisotropic vacancy-induced magnetization textures in altermagnets
A vacancy generically induces anisotropic magnetization textures in altermagnets whose multipolar form factor encodes the altermagnetic order, visible in classical systems under transverse field and in quantum systems at zero field.