发表机构
Thermal Science Research Center, Shandong Institute of Advanced Technology; Faculty of Applied Sciences, Macao Polytechnic University（山东先进技术研究院热科学研究中心; 澳门理工学院应用科学学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究证明一维补偿磁体中非相对论自旋简并可与相对论自旋劈裂共存，通过Ta₂TeSeO纳米带实现Néel矢量依赖的自旋劈裂，开辟一维交变磁应用。
AI 中文摘要
交变磁性通常通过补偿性共线磁体中的非相对论自旋劈裂能带加以识别。然而，在一维受限条件下，这一诊断特征可能消失：与边界相容的子晶格交换操作可能使唯一的布洛赫动量保持不变，从而迫使非相对论自旋向上和自旋向下谱重合。我们证明，在补偿性一维磁体中，非相对论自旋简并可以与相对论自旋劈裂共存。在基于Lieb的构造中，沿对角线的受限消除了投影的$d$波自旋劈裂，同时保留了实空间子晶格交换图案。随后，自旋-轨道耦合（SOC）将自旋锁定到晶格上，因此Néel矢量的取向选择了一个磁线群，该磁线群可以揭示自旋劈裂能带。以完全补偿的$[110]$ Ta$_2$TeSeO纳米带为原型，我们发现在继承的易轴域（$\boldsymbol N\backslashparallel[100]$或$[010]$）中，存在非相对论自旋简并能带和显著的SOC劈裂。对于足够宽且保留母体易轴序的纳米带，这种劈裂是一种平衡性质。易轴纳米带在有限理想电导下还支持约$35\%$的右行模式自旋极化。我们的结果确立了隐藏在看似常规反铁磁能带中的一维完全补偿交变磁功能。
英文摘要
Altermagnetism is normally identified by nonrelativistic spin-split bands in a compensated collinear magnet. Under one-dimensional confinement, however, this diagnostic can disappear: a boundary-compatible sublattice-exchange operation may leave the only Bloch momentum unchanged, forcing the nonrelativistic spin-up and spin-down spectra to coincide. We show that nonrelativistic spin degeneracy can coexist with relativistic spin splitting in a compensated one-dimensional magnet. In a Lieb-based construction, confinement along the diagonal cancels the projected $d$-wave spin splitting while preserving the real-space sublattice-exchange motif. Spin-orbit coupling (SOC) then locks spin to the lattice, so the Néel-vector orientation selects a magnetic line group that can reveal spin-split bands. Using fully compensated $[110]$ Ta$_2$TeSeO nanoribbons as a prototype, we find spin-degenerate nonrelativistic bands and sizable SOC splitting in the inherited easy-axis domain, $\mathbf N\parallel[100]$ or $[010]$. For sufficiently wide ribbons that retain the parent easy-axis order, this splitting is an equilibrium property. The easy-axis ribbon also supports a right-moving-mode spin polarization of about $35\%$ at finite ideal conductance. Our results establish one-dimensional fully compensated altermagnetic functionality hidden inside apparently conventional antiferromagnetic bands.
Comments6 pages, 4 figures
