应兰州大学物理科学与技术学院、磁学与磁性材料教育部重点实验室和萃英学院邀请，中国科学院物理研究所刘恩克研究员于近日来访我校并做学术报告，欢迎广大师生届时参加！

主讲人：刘恩克 研究员

题  目：Topological Electronic Behavior in Nanoflakes of Magnetic Weyl Semimetal

时  间：2020年11月14日（周六）08:35

地  点：格致楼3016

联系人：柴国志

报告摘要：

As a topological physical state, magnetic Weyl semimetals (WSMs) motivate increasing interests in the condense matter physics for low-consumption electronic devices and topological quantum computation. Recently, the quasi-two-dimensional, kagome-lattice magnetic WSM candidate Co₃Sn₂S₂ was realized experimentally [1-3], with chiral-anomaly-induced negative magnetoresistance, giant AHE, and large ANE, showing a promising potential for topological spintronics. In this talk, I will present a transport study on nanodevices of Co₃Sn₂S₂. The devices with thickness ranging from 180 nm to 30 nm have been prepared by micro-fabrications. The thin films show stable out-of-plane ferromagnetism and enhanced AHE. The anomalous Hall conductivity, Hall angle, and coercive force were measured as 1500 S/cm, 23%, and 5 T, respectively. The results indicate the topological transport behavior can be enhanced in nanoscale. Magnetic Weyl semimetal Co₃Sn₂S₂ can provide an ideal system for device physics and applications under the connection of topological physics and spintronics.

个人简介：

刘恩克，中科院物理所研究员，博士生导师。2012年毕业于物理所并留所工作，并获中科院院长奖学金特别奖、中科院百篇优秀博士论文奖。2016年-2018年以“洪堡学者”赴德国马普所进行研究访问，合作导师为Claudia Felser教授。主要从事磁性功能新材料的探索，包括磁性相变材料、磁性拓扑材料、磁性拓扑电/热输运等。在国际上实现了首个磁性外尔半金属，提出了“全过渡族Heusler合金”新家族，发现了磁相变材料的“居里温度窗口”效应等。已在Science、Nat. Phys.、Nat. Commun.、Phys. Rev. Lett.、Sci. Adv.等国际期刊上发表研究论文100余篇。曾获国家基金委“优青”基金、中科院青促会优秀会员基金、国家自然科学二等奖（4/5）等。