Zhu Haiyuan, Li Jiayu, Chen Xiaobing, Yu Yutong, Liu Qihang
Department of Physics, State key laboratory of quantum functional materials, and Guangdong Basic Research Center of Excellence for Quantum Science, Southern University of Science and Technology, Shenzhen, China.
New Cornerstone Science Laboratory, Department of Physics, The University of Hong Kong, Hong Kong, China.
Nat Commun. 2025 May 26;16(1):4882. doi: 10.1038/s41467-025-60128-2.
The combination of quantum geometry and magnetic geometry in magnets excites diverse phenomena, some critical for antiferromagnetic spintronics. However, very few material platforms have been predicted and experimentally verified to date, with the material pool restricted by the assumed need for strong spin-orbit coupling (SOC). Here, we bypass the need for SOC by considering magnetic order induced quantum geometry and corresponding nonlinear transports (NLTs) in antiferromagnets (AFMs). By integrating spin space group theory into the symmetry analysis, we find that collinear and coplanar magnetic geometries can only induce NLT driven by Berry curvature dipole, and noncoplanar ones may trigger NLT driven by dipoles of Berry curvature, inverse mass, and quantum metric. Using this approach, we establish a materials database of 260 AFMs with SOC-free NLT effects, and complement this with first-principles calculations on several prototypical material candidates. Our work not only provides a universal theoretical framework for studying various magnetism-driven transport effects, but also predicts broad, experimentally accessible material platforms for antiferromagnetic spintronics.
磁体中量子几何与磁几何的结合激发了多种现象，其中一些现象对反铁磁自旋电子学至关重要。然而，迄今为止，很少有材料平台得到预测和实验验证，材料库受限于对强自旋轨道耦合（SOC）的假定需求。在此，我们通过考虑反铁磁体（AFM）中磁序诱导的量子几何和相应的非线性输运（NLT）来绕过对SOC的需求。通过将自旋空间群理论纳入对称性分析，我们发现共线和共面磁几何只能诱导由贝里曲率偶极子驱动的NLT，而非共面磁几何可能触发由贝里曲率、逆质量和量子度规偶极子驱动的NLT。利用这种方法，我们建立了一个包含260种具有无SOC的NLT效应的AFM的材料数据库，并用对几种典型候选材料的第一性原理计算对其进行补充。我们的工作不仅为研究各种磁驱动输运效应提供了一个通用的理论框架，还预测了适用于反铁磁自旋电子学的广泛且可通过实验获取的材料平台。
