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arXiv · 2609.25919

Time-reversal-odd Transport in Odd-Parity Magnets

Ling Bai·Si Li·Libor Šmejkal·Yugui Yao·Wanxiang Feng
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Abstract

Unconventional magnets combining vanishing net magnetization with spin-split electronic structures and anomalous transport have attracted considerable attention. Using spin-group symmetry analysis, we derive general conditions for odd-parity spin splitting in two- and three-dimensional coplanar noncollinear antiferromagnets. We identify a key spin-group symmetry whose relativistic counterpart forbids time-reversal-odd transport and show that breaking it allows such transport in the presence of spin-orbit coupling. Tight-binding calculations validate these symmetry arguments and demonstrate an anomalous Hall effect in a fully compensated odd-parity magnetic state without an external field. By screening a three-dimensional magnetic materials database and constructing two-dimensional heterostructures, we further identify realistic platforms exhibiting pronounced spin-orientation-dependent anomalous Hall and magneto-optical effects. Our results establish a general symmetry framework for time-reversal-odd responses in odd-parity magnets and highlight fully compensated odd-parity magnets as a promising platform for controlling anomalous transport.

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Ling Bai, Si Li, Libor Šmejkal, Yugui Yao, Wanxiang Feng. 2026-09-22. Time-reversal-odd Transport in Odd-Parity Magnets. https://arxiv.org/abs/2609.25919

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