报告人：余雪佳教授 福州大学
邀请人：段香梅研究员
报告时间：2025年7月1日(周二)  10：30
报告地点：龙赛理科楼南楼201会议室 	
报告人简介：
 	余雪佳，博士毕业于北京大学物理学院国际量子材料科学中心，导师为徐莉梅教授。现为福州大学物理系教授，福建省高层次人才。曾获北京市优秀博士论文奖与北京大学优秀毕业生等荣誉。一直从事统计物理中量子相变拓扑物理相关的理论研究，受Physics Reports编辑部的邀请，已完成撰写国际上首篇关于量子相变拓扑物理方向的长篇综述(63页))。以第一或通讯作者发表论文25余篇，包括5篇一作PRL、1篇一作Science Bulletin、2篇通讯Communications Physics、12篇Phys.Rev系列等。近年来受邀在全国统计物理与复杂系统学术会议、统计物理与复杂系统西湖论坛、西南西北理论物理联合研讨会等国内统计物理重要会议作报告，并受邀长期担任Nature 系列，Phys. Rev. 系列，SciPost 等期刊审稿人。 
报告摘要： 
Topology forms a cornerstone of modern condensed matter and statistical physics, offering a new framework to classify the phases and phase transitions beyond the traditional Landau paradigm. However, it has long been widely believed that topological physics is destroyed when the bulk energy gap closes, making it highly nontrivial to consider topology in gapless quantum critical systems. To address these challenges, recent advancements have sought to generalize the notion of topological physics to systems without a bulk energy gap, including quantum critical points and gapless phases, collectively referred to as gapless symmetry-protected topological phases. The discovery of nontrivial topology in quantum critical systems suggests that topology plays a crucial role in classifying phase transitions even if they belong to the same universality class, fundamentally enriching the textbook understanding of phase transitions. Moreover, extending topological concepts to gapless quantum many-body systems challenges the traditional belief in condensed matter physics that topological edge states are typically associated with bulk energy gaps. Given its importance, In this talk, I will introduce recent progress in the study of topological physics in quantum critical systems, covering both theoretical and experimental advancements.

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