10月14日（周三）15：30东南大学全球名师讲堂：当交错磁性遇上非共线性

近年来，交错磁性引起了⼴泛关注。最初提出的交错磁体仅限于共线反铁磁体，其特征是⾃旋与晶体学⼦晶格的⼆重交替，由此导致 PT 对称性破缺，并在电

⼦能带结构中产⽣⾮相对论⾃旋劈裂（NRSS）。⼀般⽽⾔，电⼦能带结构中的任何⾃旋劈裂都要求 PT 对称性破缺。NRSS 并⾮共线磁体所独有，也可以出现

在⾮共线磁体中。这有⼒地表明，交错磁性的概念或许并不局限于“⼆重交替”，⽽是可以⾃然地推⼴到具有三重乃⾄N 重交替的⾮共线反铁磁体。关键问题在

于，这类⼴义交错磁体是否必然具有 NRSS。在本研究中，我们聚焦于 N 重共⾯反铁磁体并找到了产⽣ NRSS 的对称性判据。我们的分析提供了⼀种⾮常简

单的⽅法⽤于识别具有 NRSS 的共⾯反铁磁体，⽆需借助更复杂的⾃旋群理论：只需找出其中 PT 对称性破缺的体系即可。对于实验研究者⽽⾔，这提供了⼀

条实⽤的经验法则：如果共⾯反铁磁体的 PT 对称性破缺，那么实际上就会存在 NRSS，并可能对多种输运与光学响应产⽣贡献。

Altermagnetism has recently attracted extensive attention. Those originally proposed altermagnets are restricted to collinear antiferromagnets, characterized

by a binary alternation of spins and crystallographic sublattices, giving rise to broken PT symmetry and non-relativistic spin splitting (NRSS) in electronic

band structure. In general, any spin splitting in electronic band structure requires broken PT symmetry, and NRSS is not unique to collinear magnets, but can

also arise in noncollinear magnets. This strongly suggests that the concept of altermagnetism may not be confined to “binary alternation”, but can be naturally

extended to noncollinear antiferromagnets with ternary, or more generally, N-fold alternation. The key question is whether such generalized altermagnets

necessarily host NRSS. In this work, we address this question by focusing on N-fold coplanar antiferromagnets and find the symmetry criterion for NRSS.

Our analysis provides a very simple way to identify coplanar antiferromagnets with NRSS, without resorting to more sophisticated spin-group theories: one

just needs to find those with broken PT symmetry. For experimentalists, this offers a practical rule of thumb: if a coplanar antiferromagnet breaks PT, NRSS

is practically present and may contribute to a wide range of transport and optical responses.

主讲⼈ / Presenter：谢尔盖·斯特列尔佐夫教授 Prof. Sergey Streltsov

俄罗斯科学院⾦属物理所低维⾃旋系统理论实验室主任 Head, Low-Dimensional Spin Systems Lab, IMP RAS

俄罗斯科学院通讯院⼠ Corresponding Member, Russian Academy of Sciences

当交错磁性遇上⾮共线性

Altermagnetism meets non-collinearity

主办⽅ / Organizers：

东南⼤学物理学院、东南⼤学国际合作处

School of Physics, SEU; OIC, SEU

地点 / Venue:

东南⼤学九⻰湖校区

⽥家炳楼203

Room 203, Tin Ka Ping Building,

Jiulonghu Campus,

Southeast University

时间 / Date & Time：

2026年10⽉14⽇（周三）下午3:30

Wed., Oct. 14, 2026 at 3:30 PM

东南⼤学全球名师讲堂

主要内容 / Abstract：