交替磁体（altermagnets）中非相对论与相对论自旋分裂的相互作用
Interplay of nonrelativistic and relativistic spin splittings in altermagnets
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中文总结 AI 辅助
该研究揭示交替磁体中存在非相对论自旋分裂，其可调控拉什巴效应，结合后产生奈尔矢量可调的大电荷-自旋转换，为自旋电子应用提供新平台。
中文摘要 AI 辅助
尽管交替磁体（AMs）具有补偿的磁矩，但它们表现出非相对论自旋分裂（NRSS），这为不依赖相对论自旋轨道耦合的自旋电子功能提供了途径。然而，NRSS如何影响相对论现象在很大程度上尚未被探索。本文中，我们表明，在具有破缺反演对称性的AMs中，NRSS在重塑拉什巴（Rashba）效应方面发挥着关键作用。利用紧束缚模型，我们证明，拉什巴自旋分裂的幅度通常受自旋轨道耦合强度限制，却由NRSS能量尺度决定。由此产生的拉什巴能带与NRSS结合，产生了异常大的电荷-自旋转换，且具有奈尔矢量可调的自旋极化。我们对非中心对称AMs GdAlSi的第一性原理计算证实了这些效应在真实体系中的存在。我们的结果揭示了AMs中非相对论与相对论效应之间的相互作用，并确定它们是自旋轨道电子应用的理想平台。
英文摘要
Despite their compensated magnetic moments, altermagnets (AMs) exhibit nonrelativistic spin splitting (NRSS) that offers routes to spintronic functionality without relying on relativistic spin-orbit coupling. However, how NRSS influences relativistic phenomena remains largely unexplored. Here we show that NRSS plays a crucial role in reshaping the Rashba effect in AMs with broken inversion symmetry. Using a tight-binding model, we demonstrate that Rashba spin splitting, whose magnitude is typically limited by the strength of spin-orbit coupling, is governed by NRSS energy scales. The resulting Rashba bands combined with NRSS generate anomalously large charge-to-spin conversion with a Néel-vector-tunable spin polarization. First-principles calculations for the noncentrosymmetric AM GdAlSi corroborate the emergence of these effects in a real system. Our results reveal the interplay between nonrelativistic and relativistic effects in AMs and identify them as fertile platforms for spin-orbitronic applications.
