拓扑绝缘体
凝聚态物理
反铁磁性
磁性
轴子
拓扑(电路)
量子反常霍尔效应
拓扑序
物理
材料科学
量子
量子霍尔效应
电子
量子力学
数学
粒子物理学
组合数学
暗物质
作者
Hao-Ke Xu,Mingqiang Gu,Fucong Fei,Yi-Sheng Gu,Dang Liu,Qiao-Yan Yu,Sha-Sha Xue,Xu-Hui Ning,Bo Chen,Hangkai Xie,Zhen Zhu,Dandan Guan,Shiyong Wang,Yaoyi Li,Canhua Liu,Qihang Liu,Fengqi Song,Hao Zheng,Jinfeng Jia
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-06-13
卷期号:16 (6): 9810-9818
被引量:12
标识
DOI:10.1021/acsnano.2c03622
摘要
Breaking time reversal symmetry in a topological insulator may lead to quantum anomalous Hall effect and axion insulator phase. MnBi4Te7 is a recently discovered antiferromagnetic topological insulator with TN ∼ 12.5 K, which is composed of an alternatively stacked magnetic layer (MnBi2Te4) and nonmagnetic layer (Bi2Te3). By means of scanning tunneling spectroscopy, we clearly observe the electronic state present at a step edge of a magnetic MnBi2Te4 layer but absent at nonmagnetic Bi2Te3 layers at 4.5 K. Furthermore, we find that as the temperature rises above TN the edge state vanishes, while the point defect induced state persists upon an increase in temperature. These results confirm the observation of magnetism-induced edge states. Our analysis based on an axion insulator theory reveals that the nontrivial topological nature of the observed edge state.
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