反铁磁拓扑绝缘体与轴子绝缘体——MnBi2Te4系列磁性体系的研究进展

Antiferromagnetic topological insulators and axion insulators——MnBi2Te4 family magnetic systems

拓扑物质态是21世纪以来凝聚态物理领域最重要的前沿课题之一。它不仅深化了人们对宏观量子物质态的认识,同时也具有极大的潜在应用价值。目前,非磁性拓扑物质态的研究已经较为完善,而磁性拓扑物质态的研究仍处于初始阶段。近两年来,以MnBi2Te4系列体系为代表的本征磁性拓扑绝缘体的出现,迅速掀起了磁性拓扑绝缘体的研究热潮。文章从拓扑物质态的基本理论出发,介绍了近期反铁磁拓扑绝缘体方面的一些重要研究进展,着重阐述了MnBi2Te4系列的反铁磁拓扑绝缘体、静态轴子绝缘体以及动态轴子绝缘体,并对磁性拓扑绝缘体的下一步研究进行了展望。

Topological quantum states have become one of the most frontline topics in condensed matter physics since the 21 st century.They have not only deepened our understanding of the states of matter,but also hold great promise for future potential applications.Although there has been a well-established framework for nonmagnetic topological states,the study of magnetic topological states is still in its infancy.In the last two years,the discovery of the MnBi2Te4 family of intrinsic magnetic materials has given rise to an upsurge of studies on magnetic topological insulators.Here,starting from basic principles,we give a brief introduction to important advances in this field.Antiferromagnetic topological insulators,axion insulators,and dynamical axion insulators in the MnBi2Te4 family are extensively discussed.Finally,we present a simple perspective on magnetic topological states.