题目：雷和畅教授谈“Magnetic Topological Semimetals with Kagome Lattices”

时间：10月30日（周三）2: 00 - 3: 00

地点：勤园20号楼518学术报告厅

主讲人：2009年毕业于中国科学院合肥物质科学研究院固体物理研究所，获得凝聚态物理学博士学位。2009-2012年，在美国布鲁克海文国家实验室Cedomir Petrovic研究组开展博士后研究。2012年-2014年，在日本东京工业大学Hideo Hosono研究组继续从事博士后研究。2014年底回国，在中国人民大学物理系任职，主要从事实验凝聚态物理研究，包括铁基材料的合成和物性研究，新型超导体的探索以及物性研究，拓扑量子材料的制备及其中的新奇量子态研究等。目前，在《Nature》、《Nat. Phys.》《Nat. Commun.》、《Phys. Rev. Lett.》、《Phys. Rev. X》、《J. Am. Chem. Soc.》等期刊上发表研究论文140余篇，至今这些论文被引2000多次。2018年获得基金委优秀青年基金项目资助。

内容简介：The origin of anomalous Hall effect (AHE) in magnetic materials is one of the most intriguing aspect in condensed matter physics and has been a controversial for a long time. Recent studies indicate that the intrinsic AHE is closely related to the Berry curvature of occupied electronic states. In a magnetic Weyl semimetal with broken time-reversal symmetry, there are significant contributions to Berry curvature around Weyl nodes, which would lead to a large intrinsic AHE. In addition, the real-space non-coplanar spin texture can also lead to significant AHE, so called topological Hall effect (THE). On the other hand, the kagome lattice is known to host exotic quantum magnetic states. Theoretical work has predicted that kagome lattices may also host topological electronic states. In this presentation, we introduce several kinds of materials, such as Fe₃Sn₂, Co₃Sn₂S₂ and YMn₆Sn₆ with Kagome lattice, which show large AHE and THE, and it can be ascribed to the existence of Weyl or Dirac fermions in these systems as well as the real-space spin texture. It indicates that magnetic kagome metals provide a new platform to study on the emergent topological electronic properties in a correlated electron system.