Magnetic exchange induced Weyl state in a semimetal

报告题目:Magnetic exchange induced Weyl state in a semimetal

报告人: 郭艳峰 研究员,上海科技大学

报告时间:514日中午1200

报告地点:唐楼B501

 

报告摘要:I will introduce my recent work which unveiled a magnetic exchange induced Weyl state in semimetal EuCd2Sb2, a member in type IV magnetic space group, via performing high magnetic field magneto-transport measurements and ab initio calculations. For the A-type antiferromagnetic (AFM) structure of both compounds, the external magnetic field (B) larger than 3.2 T can align the Eu spins to be fully polarized along the crystallographic c-axis and consequently drive the system into a ferromagnetic (FM) state, associated by a phase transition from a small-gap AFM topological insulator into a FM Weyl semimetal. Fermi arcs connected the Weyl points are also revealed by the calculations. I will also briefly introduce my recent growth of high-quality crystals of various quantum materials.

References:

[1] Hao Su, ……., Yanfeng Guo, Magnetic exchange induced Weyl state in a semimetal EuCd2Sb2, arXiv: 1903.12532.

[2] J.-R. Soh,……, Y. F. Guo, et al., An ideal Weyl semimetal induced by magnetic exchange, arXiv: 1901.10022. 

 

个人简介: 上海科技大学物质科学与技术学院研究员、终身制序列助理教授、博导、课题组长,上海市东方学者、浦江人才计划获得者。2008年硕博连读毕业于中科院物理研究所;2008年至2012年日本国立材料研究所(NIMS)博士后;2012年至2015年牛津大学物理系博士后;2015年加入上科大任现职。长期从事新量子物质材料探索、高质量单晶生长及物理性质研究。已在Nature MaterialsNature PhysicsJACS等学术期刊发表论文70多篇,总引用次数近1500次。