磁性拓扑材料中贝利曲率驱动的非常规电输运行为  

Berry curvature induced unconventional electronic transport behaviors in magnetic topological semimetals

作　　者：杨金颖 王彬彬 刘恩克[1] Yang Jin-Ying;Wang Bin-Bin;Liu En-Ke(State Key Laboratory for Magnetism,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院物理研究所,磁学国家重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《物理学报》2023年第17期14-22,共9页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2022YFA1403800,2022YFA1403400);国家自然科学基金(批准号:11974394);中国科学院战略性先导科技专项B类(批准号:XDB33000000);综合极端装置(SECUF)中国科学院建制化科研项目资助的课题.

摘　　要：近年来,磁性拓扑材料特别是磁性Weyl半金属越来越多地被发现,为研究拓扑输运行为提供了重要载体.磁性拓扑半金属材料具有动量空间的强贝利曲率,显著增强了电子的常规横向输运行为,也使得曾经被忽略或无法观测的输运效应逐渐浮现出来,导致当前广泛采用的经典输运方程不能准确地描述磁性拓扑电子的输运行为.本文从半经典输运方程出发,介绍磁性拓扑材料中新近出现的非常规电输运行为,内容涉及化学掺杂、磁场调制拓扑电子态、贝利曲率相关的线性正磁电阻及磁场线性依赖的输运行为.这些行为为磁性与拓扑相互作用下的电输运行为提供新的理解和思考.最后,对非常规电输运的发展进行总结和展望.In recent years,more and more magnetic topological materials,especially magnetic Weyl semimetals,have been discovered,providing a platform for studying the electronic transport behavior.The strong Berry curvature of magnetic topological materials can significantly enhance the conventional transverse transport behaviors,and can also make the transport phenomena that have been overlooked or unobserved appear gradually.In this review,the semi-classical equation is used to understand the anomalous transport behaviors in magnetic topological materials.The intrinsic anomalous Hall conductivity is obtained by integrating the Berry curvature of the occupied states,which is determined by the electronic band structure.The topological electronic state can be modulated by magnetic field and doping,and the anomalous Hall conductivity was changed with the evolution of the Berry curvature.A linear positive magnetoresistance behavior associated with the Berry curvature and magnetic field is introduced,which establishes the relation between the Berry curvature and the longitudinal transport.Due to the presence of tilted Weyl cone,the conductivity terms related to the first power of magnetic field are observed in magnetic Weyl systems.These behaviors under the interaction of topology and magnetic provide a new understanding and insight for the electric transport behaviors.At last,this review also provides a viewpoint on the field of magnetic topological physics.

关 键 词：磁性拓扑材料 贝利曲率 非常规电输运 

分 类 号：O469[理学—凝聚态物理]