发表机构
Hefei University of Technology; Guangdong Polytechnic Normal University（合肥工业大学; 广东技术师范大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究人员通过第一性原理计算发现反常磁体V₂Te₂O中可通过旋转奈尔矢量调控跨层反常霍尔响应，实现高灵敏度跨层反常霍尔开关，为低功耗多轴范德华自旋电子学提供新方向。
AI 中文摘要
在范德华（vdW）材料中，弱层间耦合通常会抑制垂直色散，强化了面内输运主导跨层通道的传统范式。本研究通过第一性原理计算和磁对称性分析，在范德华反常磁体V₂Te₂O中发现了巨大的、对称性解锁的跨层反常霍尔电导率（AHC）。在奈尔矢量N//z的磁基态下，水平镜面对称保护费米能级附近的自旋极化节点链，并严格要求零反常霍尔响应；倾斜奈尔矢量会明确破坏这种镜像保护，使自旋轨道耦合打开节点链的能隙，激活显著的跨层霍尔响应。当奈尔矢量旋转至面内构型（N//x）时，跨层轨道杂化产生密集的贝里曲率热点，将AHC的跨层分量σᵧz提升至约255 S/cm，比面内分量σₓy高出近两个数量级。此外，系统改变方位角会重新分布反常霍尔响应，实现横向输运的全方向控制。本研究揭示了一种由低势垒自旋倾斜激活的高灵敏度跨层反常霍尔开关，为定向张量选择和低功耗多轴范德华自旋电子学提供了新途径。
英文摘要
In van der Waals (vdW) materials, weak interlayer coupling generally suppresses vertical dispersion, reinforcing the conventional paradigm that in-plane transport dominates over cross-layer channels. Here, using first-principles calculations and magnetic symmetry analyses, we uncover a giant, symmetry-unlocked cross-layer anomalous Hall conductivity (AHC) in the vdW altermagnet V2Te2O. In the magnetic ground state with Neel vector N//z, horizontal mirror symmetry protects a spin-polarized nodal chain near the Fermi level and strictly enforces zero anomalous Hall response. Tilting the Neel vector explicitly breaks this mirror protection, allowing spin-orbit coupling to gap the nodal chain and activate a sharp cross-layer Hall response. When the Neel vector is rotated into the in-plane configuration (N//x), cross-layer orbital hybridization generates intensive Berry curvature hotspots, boosting the cross-layer component of AHC σ_{yz} to approximately 255 S/cm, which exceeds in-plane component σ_{xy} by nearly two orders of magnitude. Furthermore, varying the azimuthal angle systematically redistributes the anomalous Hall response, enabling full directional control of transverse transport. Our findings demonstrate a highly sensitive cross-layer anomalous Hall switch activated by low-barrier spin canting, offering promising avenues for directional tensor selection and low-power multi-axial vdW spintronics.
