论文标题
在固有磁性绝缘子Mn-Bi-Te家族的拓扑表面状态下
On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family
论文作者
论文摘要
我们审查了内在磁性拓扑界绝缘子的电子结构研究（MNBI $ _2 $ TE $ _4 $）（BI $ _2 $ _2 $ TE $ _3 $）$ _ N $（$ n = 0,1,2,3 $）家族。具体而言，我们专注于光发射光谱观察到的拓扑表面状态圆锥锥的普遍（几乎）无间隙行为，即使由于表面铁磁阶的表面差异而预期较大。实验与关于这种差距行为的理论之间的二分法可能是该边界中最关键和令人困惑的问题。我们讨论了各种建议，说明缺乏对拓扑表面状态狄拉克锥缺乏磁性效应的建议，这主要分为两张图片，磁重构和拓扑表面状态重新分布。拓扑表面状态的磁性间隙的频带工程为实现较高温度下量化的拓扑传输和轴心电动力学提供了绝佳的机会。
We review recent progress in the electronic structure study of intrinsic magnetic topological insulators (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_n$ ($n=0,1,2,3$) family. Specifically, we focus on the ubiquitously (nearly) gapless behavior of the topological surface state Dirac cone observed by photoemission spectroscopy, even though a large Dirac gap is expected because of surface ferromagnetic order. The dichotomy between experiment and theory concerning this gap behavior is perhaps the most critical and puzzling question in this frontier. We discuss various proposals accounting for the lack of magnetic effect on the topological surface state Dirac cone, which are mainly categorized into two pictures, magnetic reconfiguration, and topological surface state redistribution. Band engineering towards opening a magnetic gap of topological surface states provides great opportunities to realize quantized topological transport and axion electrodynamics at higher temperatures.
