磁性拓扑绝缘体中的量子输运现象

Quantum transport phenomena in magnetic topological insulators

磁性拓扑绝缘体是过去十年里凝聚态物理学领域的一个重要研究方向,其拓扑非平庸能带结构与自旋、轨道、电荷、维度等自由度之间的相互作用可以产生丰富的拓扑量子物态和拓扑相变现象.对磁性拓扑绝缘体输运性质的研究是探索其新奇物性的重要手段,对于深入理解拓扑量子物态以及开发新型低功耗电子学器件具有重要意义.本文回顾了近年来磁性拓扑绝缘体输运实验方面的重要研究进展,包括磁性掺杂拓扑绝缘体中的量子反常霍尔效应和拓扑量子相变现象、本征反铁磁拓扑绝缘体MnBi_(2)Te_(4)中的量子反常霍尔相、轴子绝缘体相和陈绝缘体相,以及在脉冲强磁场下陈绝缘体演化出的螺旋式拓扑物态.最后,本文对未来磁性拓扑绝缘体研究的方向和该体系中尚未充分理解的输运现象进行了分析和展望.

In the past decade,magnetic topological insulators have been an important focus in condensed matter physics research.The intricate interplay between the nontrivial band topology and spin,orbit,charge,and dimensionality degrees of freedom can give rise to abundant exotic topological quantum states and topological phase transitions.Measuring the transport properties of magnetic topological insulators is a crucial approach to exploring their exotic properties,which is of significant scientific importance in deepening our understanding of topological quantum states.Simultaneously,it also holds substantial potential applications in the development of novel low-power electronic devices.In this work,experimental progress of transport researches of magnetic topological insulators is reviewed,including quantum anomalous Hall effect and topological quantum phase transitions in magnetically doped topological insulators,the quantum anomalous Hall phase,axion insulator phase and Chern insulator phase in intrinsic antiferromagnetic topological insulator MnBi_(2)Te_(4),as well as the helical phase emerged from the Chern insulator in pulsed high magnetic fields.Finally,this work analyzes the future direction of development in magnetic topological insulators,and the transport phenomena that have not been understood in these systems,offering an insight into and perspectives on the potential breakthroughs to be achieved in this area of research.