AI 中文总结
研究交替磁体中自旋轨道磁性机制，运用定向自旋群理论等解开微扰行为，发现同轴霍尔效应，为识别潜在交替磁体候选物提供系统对称性方法，助力高性能无杂散场自旋电子学应用。
AI 中文摘要
长期以来，包括交替磁体在内的反铁磁体尽管净磁化强度极小却能表现出显著反常霍尔效应的机制一直难以捉摸。在此，通过运用定向自旋群理论和自旋轨道耦合张量展开，我们系统地解开了轨道和自旋磁化强度相对于自旋轨道耦合的微扰行为。值得注意的是，我们发现只有当相反自旋子晶格通过四重旋转相连时，轨道和自旋磁化强度才会呈现不同的微扰阶数。在这些交替磁体中，我们进一步发现了一种同轴霍尔效应，其特征是诱导的自旋和轨道磁化强度与奈尔矢量平行排列，我们通过对交替磁体KV₂Se₂O₂进行第一性原理计算进一步证明了这一点。这种效应在弱外场下实现奈尔序的确定性切换方面具有很大潜力。我们的工作提供了一种系统的对称性方法来识别结合大反常霍尔效应和最小净磁化强度的潜在交替磁体候选物，为高性能、无杂散场的自旋电子学应用铺平了道路。
英文摘要
While the anomalous Hall effect was proposed as a transport fingerprint of altermagnets, it originates from the spin-orbit coupling-induced net magnetization, corresponding to a distinct magnetic phase termed spin-orbit magnetism. However, the microscopic mechanism enabling spin-orbit magnets to yield a prominent anomalous Hall response despite a vanishingly small net magnetization remains elusive. Here, by employing oriented spin group theory and spin-orbit-coupling tensor expansion, we systematically disentangle the perturbative behaviors of orbital and spin magnetizations with respect to spin-orbit coupling in altermagnets. Remarkably, we find that only if the opposite-spin sublattices are connected through a fourfold rotation, the orbital and spin magnetizations exhibit distinct perturbative orders. In these altermagnets, we further discover a coaxial Hall effect characterized by the induced spin and orbital magnetizations aligning parallel to the Néel vector, which we further demonstrate by first-principles calculations in the altermagnet KV$_{2}$Se$_{2}$O. This effect holds great promise for achieving deterministic switching of the Néel order under weak external fields. Our work provides a systematic symmetry approach to identify potential altermagnetic candidates combining a large anomalous Hall effect with minimal net magnetization, paving the way for high-performance, stray-field-free spintronic applications.
Comments6 pages, 3 figurs, 1 table
