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报告人：严忠波 教授

时 间：北京时间2025年12月30日（周二）上午 10:00

地 点：腾讯会议#：764 680 040

摘要：

光驱动是调控电子能带结构的有力手段，并能够产生静态系统中不存在的物相。在本次报告中，我将介绍利用此方法在磁性系统中实现的几类新奇物相。其中第一类是具有嵌套型费米弧的外尔半金属[1]。我们发现圆偏振光可以将交叉直节线转变为外尔点，且导致平面陈数沿着布里渊区的特定方向均非零，从而导致在系统的边界上出现相互嵌套的费米弧。第二类是具有奇宇称型自旋劈裂的交错磁体[2]。我们发现对具有狄拉克型能带结构的PT对称的反铁磁，引入圆偏振光打破PT对称性，可以产生奇宇称型的自旋劈裂。基于这类奇宇称型交错磁体的堆叠，我们进一步发现可以实现类似各种自旋轨道耦合效应导致的能带结构，代表性的如Rashba自旋轨道耦合[3]。我们证明基于这样的能带结构，可以实现Rashba自旋轨道耦合导致的各类独特物理效应，如Edelstein效应和拓扑超导。

[1] D. Liu, Z. Yan, et al., arXiv: 2507.04489；

[2] D. Liu, Z. Yan, et al., arXiv: 2508.18306；

[3] D. Liu, Z. Yan, et al., to appear.

简历：

严忠波，中山大学星空手机网页版登录入口教授，博士生导师。2009年和2015年在中国科学技术大学近代物理系分别取得学士和博士学位，2015年至2018年间在清华大学高等研究院从事博士后研究，2018年至2024年任职中山大学星空手机网页版登录入口副教授，2024年4月起任职教授。主要致力于拓扑物态的理论研究，近期研究兴趣主要集中在拓扑超导和非常规反铁磁等方向。目前已在PRL,PRB等物理学期刊上发表60余篇论文。

联系方式：dfwang@bit.edu.cn

邀请人： 王东飞 教授

网 址：http://physics.bit.edu.cn/

承办单位：星空手机网页版登录入口、先进光电量子结构设计与测量教育部重点实验室

*Reporter：Prof. Zhongbo Yan

*Time：10 : 00 am, 30 December 2025 (Tuesday) UTC+10:00

*Place：Tencent Meeting: 764 680 040

*Abstract:

Light driving is a powerful method for manipulating electronic band structures and can induce phases of matter that do not exist in static systems. In this talk, I will introduce several types of novel phases realized in magnetic systems using this approach. The first type is a Weyl semimetal with linked Fermi arcs [1]. We demonstrate that circularly polarized light (CPL) can transform crossed straight nodal lines into Weyl points, leading to nonzero planar Chern numbers across the Brillouin zone along specific directions, which in turn results in mutually linked Fermi arcs on the system’s surface. The second type is an altermagnet with odd-parity spin splitting [2]. We find that in PT-symmetric antiferromagnets with Dirac band structures, introducing CPL to break PT symmetry can generate odd-parity spin splitting. By stacking such odd-parity altermagnets, we further show that it is possible to achieve band structures resembling those induced by various spin-orbit couplings, with Rashba spin-orbit coupling being a representative example. We demonstrate that, based on such band structures, various well-known physical effects arising from Rashba spin-orbit coupling—such as the Edelstein effect and topological superconductivity—can be achieved.

[1] D. Liu, Z. Yan, et al., arXiv: 2507.04489；[2] D. Liu, Z. Yan, et al., arXiv: 2508.18306；

[3] D. Liu, Z. Yan, et al., to appear.

*Profile：

Zhongbo Yan is currently a Professor at the School of Physics, Sun Yat-sen University. He earned his Bachelor’s degree in 2009 and his Doctorate in 2009 and 2015, both from the University of Science and Technology of China. Between 2015 and 2018, he served as a Postdoctoral Researcher at the Institute for Advanced Study, Tsinghua University. From 2018 to 2024, He held the position of Associate Professor at the School of Physics, Sun Yat-sen University, and was prompted to Full Professor in April 2024. His primary research focus is on the theoretical understanding of topological phases of matter, with recent research interests centering on topological superconductivity and unconventional antiferromagnets. To date, he has authored more than 60 peer-reviewed papers, with more than 40 papers published in APS Journals.

Contact Person: Prof. Dongfei Wang

Email：dfwang@bit.edu.cn

Website：http://physics.bit.edu.cn/

Hosting Organization：School of Physics, Beijing Institute of Technology; Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE)