题目：Topologically Enhanced Transverse Electronic Transport Effects in Magnetic Weyl Semimetal Co₃Sn₂S₂

报告人：刘恩克 副研究员

        中科院物理研究所

时间：2019年3月29日（周五）下午15:00

地点：国家脉冲强磁场科学中心B206

报告摘要：

Topological physical states originating from non-trivial band characters in momentum space have motivated increasing interests in the condense matter physics. The magnetic Weyl semimetals with magnetic monopoles of Berry curvature is expected to generate the gaint, intrinsic transverse transport effects. In this talk, I will present a quasi-two-dimensional, kagome-lattice magnetic Weyl semimetal Co₃Sn₂S₂. The chiral-anomaly-induced negative magnetoresistance, ARPES and STM observations provide signatures of Weyl fermions in Co₃Sn₂S₂. The intrinsic properties including anomalous Hall conductivity, anomalous Hall angle, anomalous Nernst effect, and transverse thermoelectric conductivity are observed experimentally to reach up to an order of magnitudes larger than common magnetic systems. Our study establishes kagome-lattice magnetic Weyl semimetal with an out-of-plane ferromagnetic order as a key class of materials for fundamental research and device applications under the connection of topological physics and spintronics/spin-caloritronics.

报告人简介：

刘恩克，中科院物理所副研究员，博士生导师。2012年毕业于中科院物理所，并留所于磁学国家重点实验室工作。2016-2018年赴德国马普固体化学物理所及马普微结构物理所访问研究。主要从事磁学与磁性功能新材料设计与探索，包括磁相变材料、磁性拓扑半金属、自旋电输运材料、单自旋半金属等。实现了首个磁性外尔半金属，在kagome晶格上观察到了拓扑相关的内禀大反常霍尔效应；提出了“全过渡族”Heusler合金新家族，开发出高强韧磁场驱动磁相变材料；发现了六角型磁相变合金的“居里温度窗口”效应，提出了“等结构合金化”磁相变设计方法。已在Nat Phys、Nat Commum、Adv Mater、APL、PRB等国际期刊上发表研究论文100余篇。曾获中科院“院长奖学金”特别奖、中科院“百篇优秀博士论文奖”、“国家自然科学奖”二等奖、国家基金委“优青”基金（2017）获得者、中科院“青促会优秀会员”基金（2017）获得者。

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