报告人：何俊峰 教授 (中国科学技术大学)

时 间：2023年9月11号（周一）下午15：00-16：00

地 点：良乡校区物理实验中心229会议室

摘要：

The van Hove singularity (vHS) in two-dimensional materials can be described by a saddle point connecting an electron-like band to a hole-like band. It has been considered as a driving source for unconventional electronic orders in correlated materials. Recently, Kagome materials have attracted a lot of attention. The existence of multiple vHSs in the electronic structure of Kagome metals provides a fertile territory to explore the possible manifestation of van Hove scenario in Kagome materials. This expectation is also in accord with the experimental observations of superconductivity and charge density wave in Kagome metals, which are the two leading instabilities of the two-dimensional vHS. However, despite the exciting theoretical proposals, the role of vHSs in Kagome metals remains to be examined experimentally. By using angle-resolved photoemission spectroscopy (ARPES) measurements, we have examined the electronic structure of AV3Sb5 (A=Cs, Rb, K) and related Kagome materials. These results have revealed the relationship between vHSs and electronic orders in these Kagome materials.

简历：

何俊峰，中国科学技术大学教授, 博士生导师。2013年在中国科学院物理研究所获得凝聚态物理博士学位，2013-2015年在波士顿学院从事博士后研究，2015-2018年在斯坦福大学从事博士后研究，2018年担任日本广岛大学客座教授。主要从事量子材料的电子结构研究，在包括Nature，Science，Nature Materials，Science Advances，PRL，PNAS，Nature Communications等国际重要学术期刊上发表论文60余篇。入选国家级创新人才青年项目，主持中国科学院对外合作重点项目，基金委面上项目，参与科技部重大项目，中国科大人才团队项目等。

Email: jfhe@ustc.edu.cn

联系方式：zhiweiwang@bit.edu.cn

邀 请 人：王秩伟 研究员

网 址：http:/

承办单位：新葡萄88805官网、先进光电量子结构设计与测量教育部重点实验室