发表机构
School of Physics, Northwest University; Institute of Modern Physics, Northwest University; School of physics and astronomy, Beijing Normal University; College of Materials Science and Engineering, Changsha University of Science & Technology（西北大学物理学院; 西北大学现代物理研究所; 北京师范大学物理与天文学院; 长沙理工大学材料科学与工程学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出利用光辐照可在传统共线反铁磁体中诱导奇宇称与混合宇称磁性，结合Floquet理论与第一性原理计算揭示了不同偏振光及电场、应变对自旋劈裂的调控机制，为光控磁现象提供了通用策略。
AI 中文摘要
交替磁性（Altermagnetism）是一种超越传统铁磁与反铁磁范式的独特磁性有序形式，其特征为实空间中补偿的共线磁矩以及具有偶宇称对称性的动量依赖自旋劈裂。然而，在完全补偿的共线磁体中实现奇宇称与混合宇称磁性仍具挑战性。本文中，我们证明光辐照可在传统共线反铁磁体中诱导奇宇称与混合宇称磁性。以单层CoS和CoSe为代表性体系，结合Floquet理论与第一性原理计算，我们发现圆偏振光（CPL）可诱导奇宇称f波自旋劈裂，而椭圆偏振光（EPL）则诱导奇宇称p波自旋劈裂；单轴应变结合CPL为实现p波态提供了另一种途径。更值得注意的是，将电场与CPL或EPL共同施加时，自旋劈裂会转变为混合宇称形式。光诱导的PT对称性破缺与自旋轨道耦合共同产生有限的反常霍尔响应。本研究为在补偿反铁磁体中调控奇宇称与混合宇称自旋劈裂建立了通用策略，为实现光控电子与磁现象提供了途径。
英文摘要
Altermagnetism, characterized by compensated collinear magnetic moments in real space and momentum-dependent spin splitting with even-parity symmetry, has recently emerged as a distinct form of magnetic order beyond the conventional ferro- and antiferromagnetic paradigms. However, realizing odd- and mixed-parity magnetism in fully compensated collinear magnets remains challenging. Here, we demonstrate that light irradiation can induce odd- and mixed-parity magnetism in conventional collinear antiferromagnets. Taking monolayer CoS and CoSe as representative systems, and combining Floquet theory with first-principles calculations, we show that circularly polarized light (CPL) induces odd-parity $f$-wave spin splitting, whereas elliptically polarized light (EPL) induces odd-parity $p$-wave spin splitting. Uniaxial strain combined with CPL provides an alternative route to realizing the $p$-wave state. More remarkably, applying an electric field together with CPL or EPL transforms the spin splitting into mixed-parity forms. The light-induced breaking of $\mathcal{PT}$ symmetry, together with spin-orbit coupling, further gives rise to a finite anomalous Hall response. Our work establishes a versatile strategy for engineering odd- and mixed-parity spin splitting in compensated antiferromagnets, offering a route toward light-controlled electronic and magnetic phenomena.
Comments10 pages, 7 figures
