报告人：雷群利 研究员（南京大学）

时 间：2026年9月23日（周三）下午15点30

地 点：理学楼B203会议室

摘要：

Since the discovery of duality-induced hidden symmetry and the associated Kramers-like degeneracy in two-dimensional (2D) mechanical networks, extending this framework to three-dimensional (3D) mechanical systems has remained a challenge. Here, we introduce a theoretical advance for designing 3D mechanical networks with hidden symmetry based on isospectral transformations. Using this theory, we design various 3D mechanical networks with Kramers-like degeneracy and reveal their topological and non-Abelian consequences. In a D_3d network, we find breaking the hidden symmetry splits a fourfold Dirac line into double helix Weyl lines which support drumhead surface states. We further consider a distinct stacked p31m network whose global soft deformation connects configurations on opposite sides of a self-dual point. Tracing this deformation reveals the splitting of a Yang monopole into Weyl points and the reversal of the surface-state polarization between dual configurations. Finally, using the same network geometry, we also demonstrate a 3D non-Abelian mechanism and its advantage over its 2D counterparts.

简历：

雷群利，南京大学物理学院准聘副教授、研究员，博士生导师。2011年获南京大学物理学学士学位，2016年获南京大学理论物理学博士学位，之后在新加坡南洋理工大学从事博士后研究工作。2021年入选国家海外高层次青年人才项目。主要从事软凝聚态物理和统计物理方面的研究，具体包括：无序超均匀态、活性物质、动力学相变和临界现象、软力学超材料、自组装光子/声子晶体、高分子和生物物理等。目前已在包括PRX, PRL, Sci. Adv., PNAS, Adv. Mater., ACS Nano等在内的国际学术期刊上发表论文30余篇。

联系方式：yanweili@bit.edu.cn

邀请人： 李艳伟

网 址：http://physics.bit.edu.cn/

承办单位：物理学院、先进光电量子结构设计与测量教育部重点实验室