论文标题
内在磁性拓扑绝缘子的轨道复杂性MNBI $ _4 $ TE $ _7 $和MNBI $ _6 $ TE $ _ {10} $
Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi$_4$Te$_7$ and MnBi$_6$Te$_{10}$
论文作者
论文摘要
使用角度分辨的光电子光谱（ARPES），我们研究了磁性范德华的表面电子结构MNBI $ _4 $ _4 $ _4 $ te $ _7 $和mnbi $ _6 $ _6 $ _6 $ _ te $ _ {10} $，$ n = $ n = $ 〜1和2 （Bi $ _2 $ TE $ _3 $）$ _ N $（MNBI $ _2 $ TE $ _4 $）系列，这些系列引起了最近作为固有的磁性拓扑拓扑器的兴趣。通过密度功能理论的计算，将圆形二色性，自旋分辨率和光子能量依赖性ARPE的测量结合在一起，我们在表面电子结构中揭示了依赖的轨道和自旋质地，以及与小动物表面波段的旋转质地。我们发现，拓扑表面状态的狄拉克锥分散体与Valence-band状态的Bi $ _2 $ _2 $ _3 $ _3 $端端的表面对MNBI $ _2 $ _2 $ _4 $ _4 $ _4 $ termented-terminated-terminated-terminated表面都保留。我们的结果牢固地建立了这些磁性范德华材料的拓扑性质性质，并表明实现量化异常的霍尔电导率的可能性取决于表面终止。
Using angle-resolved photoelectron spectroscopy (ARPES), we investigate the surface electronic structure of the magnetic van der Waals compounds MnBi$_4$Te$_7$ and MnBi$_6$Te$_{10}$, the $n=$~1 and 2 members of a modular (Bi$_2$Te$_3$)$_n$(MnBi$_2$Te$_4$) series, which have attracted recent interest as intrinsic magnetic topological insulators. Combining circular dichroic, spin-resolved and photon-energy-dependent ARPES measurements with calculations based on density functional theory, we unveil complex momentum-dependent orbital and spin textures in the surface electronic structure and disentangle topological from trivial surface bands. We find that the Dirac-cone dispersion of the topologial surface state is strongly perturbed by hybridization with valence-band states for Bi$_2$Te$_3$-terminated surfaces but remains preserved for MnBi$_2$Te$_4$-terminated surfaces. Our results firmly establish the topologically non-trivial nature of these magnetic van der Waals materials and indicate that the possibility of realizing a quantized anomalous Hall conductivity depends on surface termination.
