论文标题
MNBI中的表面铁磁和无间隙拓扑状态的共存
Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi$_2$Te$_4$
论文作者
论文摘要
表面磁性及其与电子结构的相关性对于了解内在的磁性绝缘体MNBI MNBI中的无间隙拓扑表面状态至关重要。在这里，使用静态和时间分解的角度分辨光发射光谱（ARPES），我们发现ARPES强度的显着变化以及在Rashba样传导带上的间隙开口。与模型模拟的比较强烈表明，裂解的MNBI $ _2 $ TE $ _4 $上的表面磁性与其批量状态相同。表面铁磁性和无间隙TSS的共存发现了可能导致低量子异常的MNBI MNBI MNBI $ _2 $ _2 $ _4 $ _4 $的MNBI $ _2 $ TE $ _4 $的新颖复杂性。
Surface magnetism and its correlation with the electronic structure are critical to understand the gapless topological surface state in the intrinsic magnetic topological insulator MnBi$_2$Te$_4$. Here, using static and time resolved angle-resolved photoemission spectroscopy (ARPES), we find a significant ARPES intensity change together with a gap opening on a Rashba-like conduction band. Comparison with a model simulation strongly indicates that the surface magnetism on cleaved MnBi$_2$Te$_4$ is the same as its bulk state. The coexistence of surface ferromagnetism and a gapless TSS uncovers the novel complexity of MnBi$_2$Te$_4$ that may be responsible for the low quantum anomalous Hall temperature of exfoliated MnBi$_2$Te$_4$.
