主讲人：魏苏淮，宁波东方理工大学教授
时 间：2026年10月25日10：00
地 点：物电学院A栋334
联系人：唐黎明
讲座摘要：Altermagnetism has emerged as a distinct form of compensated collinear magnetism, exhibiting exchange-driven spin splitting even in the absence of spin-orbit coupling. However, identifying altermagnets has so far largely relied on full magnetic-space-group or spin-group analyses. These formal approaches, although precise, are lack of intuition of the real-space origin of the spin splitting and provide limited guidance for intuitive materials design. In this work, we show that altermagnetic spin splitting can be diagnosed from a minimal real-space criterion: how the crystallographic operations of the nonmagnetic reference structure permute the two opposite-spin sublattices. For antiferromagnets with equal magnetic and nonmagnetic unit cell (EMNUC), this reduces the global diagnosis to the action of inversion-type operations. Altermagnetic splitting is allowed when inversion is absent or when inversion preserves each spin sublattice, whereas a sublattice-exchanging inversion restores same-k spin degeneracy globally and yields an ordinary spin-degenerate antiferromagnet. First-principles calculations on representative materials demonstrate both noncentrosymmetric and centrosymmetric routes to altermagnetism. The same real-space logic can also be naturally extended to low-dimensional crystals and quasicrystals.
主讲人简介：魏苏淮，宁波东方理工大学讲座教授、物理学院院长，国家特聘专家，美国物理学会会士（APS Fellow），国际材料学会会士（MRS Fellow）。1981年本科毕业于复旦大学并通过CUSPEA项目去美国留学，1985年在美国威廉玛丽学院取得理学博士学位，1985年-2015年在美国可再生能源国家实验室(NREL)工作，2015年回国前担任NREL理论研究室主任，实验室Fellow，2015年-2024年6月任北京计算科学研究中心讲座教授、材料与能源研究部主任。在半导体能带理论、缺陷与合金物理、能源与光电材料设计、计算方法等方面取得了系统的原创性成果。已发表SCI论文650余篇，包括80余篇PRL。论文引用大于90000多次。
