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arXiv · 2509.15604

Spin-Orbital Altermagnetism

Zi-Ming Wang·Yang Zhang·Song-Bo Zhang·Jin-Hua Sun·Elbio Dagotto·Dong-Hui Xu·Lun-Hui Hu
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Abstract

Altermagnet is a newly discovered magnetic phase, characterized by non-relativistic spin-splitting that has been experimentally observed. Here, we introduce a framework dubbed {\it spin-orbital altermagnetism} to achieve spin-orbital textures in altermagnetic materials. We identify two distinct classes of spin-orbital altermagnetism: intrinsic and extrinsic. The intrinsic type emerges from symmetry-compensated magnetic orders with spontaneously broken parity-time symmetry, while the extrinsic type stems from translational-symmetry breaking between sublattices, as exemplified by the Jahn-Teller-driven structural phase transition. In addition to directly measuring the spin-orbital texture, we propose spin conductivity and spin-resolved orbital polarization as effective methods for detecting these altermagnets. Additionally, a symmetry-breaking mechanism induces weak spin magnetization, further revealing the peculiar feature of spin-orbital altermagnetism. We also utilize the staggered susceptibility to illustrate a potential realization of this phase in a two-orbital interacting system. Our work provides a new platform to explore spin-orbital locked physics, extending the materials classes that may display complex spin textures from the standard $4d-5d$ compounds to $3d$ compounds.

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Zi-Ming Wang, Yang Zhang, Song-Bo Zhang, Jin-Hua Sun, Elbio Dagotto, Dong-Hui Xu, Lun-Hui Hu. 2025-09-19. Spin-Orbital Altermagnetism. https://arxiv.org/abs/2509.15604

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