缺陷几何选择二维交替磁体中的极化和反常霍尔相
Defect Geometry Selects Polar and Anomalous Hall Phases in Two-Dimensional Altermagnets
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中文总结 AI 辅助
该研究以V2Se2O等二维交替磁体为对象，结合对称性分析等方法，揭示点缺陷几何可调控交替磁体的自旋织构与输运性质，为工程化相关相提供通用途径。
中文摘要 AI 辅助
交替磁体中的点缺陷可通过选择性破坏晶体对称性，产生原始主体中不存在的相。结合对称性分析、第一性原理计算和哈密顿建模，我们确定点杂质如何修改交替磁相。以原始d波交替磁单层V2Se2O为测试平台，我们识别出三类不同杂质：保留自旋-动量锁定的杂质、诱导与Edelstein自旋转换相关的混合宇称态的杂质，以及产生具有反常霍尔效应的金属亚铁磁态的杂质。我们进一步讨论二维交替磁体对 点杂质的鲁棒性，对Mn4N2和2H-FeBr3等其他二维体系的结果显示，在不同晶格和母体自旋谐波中存在相同的基于对称性的控制，确立缺陷几何是调控自旋织构和输运性质的通用途径。
英文摘要
Point defects in altermagnets can create phases absent in the pristine host by selectively breaking crystal symmetries. Combining symmetry analysis, first-principles calculations, and Hamiltonian modeling, we identify how point impurities modify the altermagnetic phase. Using the pristine d- wave altermagnetic monolayer V2Se2O as a testbed, we identify three distinct classes of impurities: those that preserve spin-momentum locking, those that induce a hybrid-parity state associated with Edelstein spin conversion, and those that produce a metallic ferrimagnetic state with an anomalous Hall effect. We further discuss the robustness of two-dimensional altermagnets against point impurities. Results for other two-dimensional systems, such as Mn4N2 and 2H-FeBr3, reveal the same symmetry-based control across distinct lattices and parent spin harmonics, establishing defect geometry as a general route for engineering spin textures and transport properties.
