发表机构
Pohang University of Science and Technology; Korea Advanced Institute of Science and Technology（浦项科技大学; 韩国科学技术院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究揭示自旋轨道纠缠多轨道态可承载磁八极自由度，在拉什巴系统中实现纯磁八极极限，通过磁八极拉什巴-埃德尔斯坦效应电产生非平衡多极磁极化，且其响应可主导传统自旋响应。
AI 中文摘要
磁多极子作为非常规磁体中的序参量和动力学自由度已受到越来越多的关注，但它们能作为活性电子自由度涌现的广泛程度仍不清楚。本文表明，自旋轨道纠缠的多轨道态可承载磁八极（MO）自由度；在拉什巴（Rashba）系统中，这会产生伴随J-拉什巴纹理的MO拉什巴纹理。值得注意的是，自旋轨道纠缠可实现纯MO极限，其中自旋和轨道角动量纹理消失，而MO纹理仍保持有限。外加电场通过MO拉什巴-埃德尔斯坦效应将该纹理转化为非平衡MO极化；在纯MO区域附近，MO埃德尔斯坦响应主导了传统自旋响应，表明多极响应未必是偶极自旋物理的小修正。本文结果为自旋轨道耦合系统中电产生非平衡多极磁极化建立了基于界面的途径。
英文摘要
Magnetic multipoles have attracted growing interest as order parameters and dynamical degrees of freedom in unconventional magnets, yet it remains unclear how broadly they can emerge as active electronic degrees of freedom. Here, we show that spin-orbit-entangled multiorbital states can host magnetic octupole (MO) degrees of freedom. In Rashba systems, this gives rise to an MO Rashba texture accompanying the J-Rashba texture. Remarkably, spin-orbital entanglement can realize a pure-MO limit in which the spin and orbital-angular-momentum textures vanish while the MO texture remains finite. An applied electric field converts this texture into a nonequilibrium MO polarization through an MO Rashba-Edelstein effect. Around the pure-MO regime, the MO Edelstein response dominates over the conventional spin response, showing that multipolar responses need not be small corrections to dipolar spin physics. Our results establish an interface-based route for electrically generating nonequilibrium multipolar magnetic polarization in spin-orbit-coupled systems.
Comments8+16 pages, 4+3 figures
