磁性拓扑绝缘体中的量子反常霍尔效应  

Quantum anomalous Hall effect in magnetic topological insulators

作　　者：冯硝 何珂 薛其坤[1,2,3] FENG Xiao;HE Ke;XUE Qikun(Department of Physics,Tsinghua University,Beijing 100084,China;State Key Laboratory of Low Dimensional Quantum Physics(Tsinghua University),Beijing 100084,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China)

机构地区：[1]清华大学物理系,北京100084 [2]低维量子物理国家重点实验室(清华大学),北京100084 [3]北京量子信息科学研究院,北京100193

出　　处：《哈尔滨工业大学学报》2020年第6期1-11,共11页Journal of Harbin Institute of Technology

基　　金：国家重点基础研究发展规划(2018YFA0307100,2017YFA0303303);国家自然科学基金(51661135024)。

摘　　要：量子反常霍尔效应是一种不需要外磁场、具有手性边缘态的量子化霍尔效应,可以用于构建其他新奇量子态和发展未来低功耗电子学器件等.该全新的量子效应于2012年首先由中国科学家在五层Cr掺杂的(Bi,Sb)2Te3拓扑绝缘体薄膜中实现.在过去七年间,经过大家的努力,其观测温度从最初的30 mK已经提高到2 K左右,进一步提高量子反常霍尔效应的观测温度是目前该领域主要的研究方向之一,是许多拓扑量子效应走向应用的关键因素.本文主要总结了量子反常霍尔效应研究的实验进展,特别在提高其观测温度方面的研究进展.文章包括四个部分:前两个部分分别介绍磁性掺杂和磁性近邻拓扑绝缘体体系中量子反常霍尔效应研究,第三部分介绍最新发现的内禀磁性拓扑绝缘体体系,最后一部分对设计和构造高温量子反常霍尔效应系统的原理和路线图给出一些建议和展望.The quantum anomalous Hall effect(QAHE)is a quantized Hall effect without external magnetic field,which has chiral edge states and can be used for developing low consumption electronic devices and constructing other novel quantum states.At the end of 2012,the QAHE was first observed by Chinese scientists in Cr-doped(Bi,Sb)2Te3 topological insulator thin films.In the past seven years,the observation temperature has been raised from 30 mK to about 2 K.Further raising observation temperature is essential for the applications of many quantum effects,which is one of the major research directions in the field of topological quantum physics and materials.In this review,we summarize the experimental progresses in the study of QAHE in magnetic topological insulators,especially in the aspect of QAHE observation temperature.The article consists of four parts:in the first two parts,the QAHE in doping and proximity-effect induced magnetic topological insulators is introduced.In the third part,the newly discovered intrinsic magnetic topological insulator system is presented.The last part gives some perspectives about possible principle and roadmap of how to design and build QAH systems at high temperatures.

关 键 词：量子反常霍尔效应 拓扑绝缘体 铁磁绝缘体 反铁磁绝缘体 分子束外延 

分 类 号：O469[理学—凝聚态物理]