交变磁体中时间反演偶和奇自旋霍尔电导率张量的计算对称性层级
Computational symmetry hierarchy of time-reversal-even and -odd spin Hall conductivity tensors in altermagnets
- Kyung Hee University（庆熙大学）
- Korea Institute of Science and Technology Information (KISTI)（韩国科学技术信息研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究通过对称性分析与第一性原理计算，将交变磁体自旋霍尔电导率分解为时间反演偶和奇通道，建立计算预筛选框架，并扩展至62种反铁磁体，识别出设计极限。
AI中文摘要：
预测磁性晶体的完整自旋霍尔电导率张量是困难的，因为晶体对称性和磁对称性并不能以相同方式约束响应的所有部分。在此，我们将交变磁体的自旋霍尔电导率分解为时间反演偶和奇通道，并结合对称性分析与第一性原理计算，对跨越不同晶体类别的六种代表性化合物进行研究。偶通道遵循与贝里曲率费米海起源一致的晶体学选择规则。奇通道由磁对称性决定，并可通过其空间部分源自螺旋轴或滑移面的反幺正操作进行重塑。动量分辨分析进一步将偶响应与自旋轨道驱动的避免交叉联系起来，将奇响应与近费米能级的各向异性自旋电流响应纹理联系起来。通过将晶体学和磁对称性操作转化为对完整27分量自旋霍尔电导率张量的线性约束，该框架提供了一种计算预筛选途径，可在密集的第一性原理输运计算之前识别对称性允许的自旋霍尔通道。将相同的分析扩展到62种自旋分裂共线反铁磁体，生成了磁点群张量图谱，确定了设计极限，如CuF2中完整的13/14张量划分和MnSe中单参数时间奇张量压缩。
英文摘要：
Predicting the full spin Hall conductivity tensor of a magnetic crystal is difficult because crystallographic and magnetic symmetries do not constrain all parts of the response in the same way. Here, we separate the spin Hall conductivity of altermagnets into time-reversal-even and time-reversal-odd channels and combine symmetry analysis with first-principles calculations for six representative compounds spanning distinct crystallographic classes. The even channel follows crystallographic selection rules consistent with its Berry-curvature Fermi-sea origin. The odd channel is set by magnetic symmetry and can be reshaped by antiunitary operations whose spatial parts originate from screw or glide symmetries. Momentum-resolved analysis further links the even response to spin-orbit-driven avoided crossings and the odd response to anisotropic near-Fermi-level spin-current response textures. By converting crystallographic and magnetic symmetry operations into linear constraints on the full 27-component SHC tensor, this framework provides a computational prescreening route for identifying symmetry-allowed spin Hall channels before dense first-principles transport calculations. Extending the same analysis to 62 spin-split collinear antiferromagnets yields a magnetic-point-group tensor atlas, identifying design limits such as the complete 13/14tensor partition in CuF2 and the one-parameter time-odd tensor compression in MnSe.
