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arXiv · 2610.11807

Photoinduced Odd- and Mixed-Parity Magnetism in Collinear Antiferromagnets

Jin-Yang Li·Ruo-Yu Ning·Ying Zhang·Qiu-Qiu Li·Si Li·Wen-Li Yang
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Abstract

Altermagnetism, characterized by compensated collinear magnetic moments and even-parity momentum-dependent spin splitting, has emerged as a distinct form of magnetic order. However, realizing odd- and mixed-parity magnetism in fully compensated collinear magnets remains challenging. Here, we demonstrate light-induced odd- and mixed-parity magnetism in conventional collinear antiferromagnets. Combining Floquet theory with first-principles calculations, we show that circularly polarized light (CPL) induces odd-parity $f$-wave spin splitting in monolayer CoS and CoSe, whereas elliptically polarized light (EPL) induces $p$-wave spin splitting. Uniaxial strain combined with CPL offers an alternative route to the $p$-wave state. Furthermore, combining an electric field with CPL or EPL generates mixed-parity spin splitting. Light-induced breaking of $\mathcal{PT}$ symmetry, together with spin-orbit coupling, gives rise to a finite anomalous Hall response. Our findings establish a versatile approach to engineering spin splitting and controlling electronic and magnetic properties in compensated antiferromagnets.

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Jin-Yang Li, Ruo-Yu Ning, Ying Zhang, Qiu-Qiu Li, Si Li, Wen-Li Yang. 2026-10-21. Photoinduced Odd- and Mixed-Parity Magnetism in Collinear Antiferromagnets. https://arxiv.org/abs/2610.11807

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