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Half-Magnetic Topological Insulator with Magnetization-Induced Dirac Gap at a Selected Surface
Physical Review X ( IF 12.5 ) Pub Date : 2021-02-25 , DOI: 10.1103/physrevx.11.011039
Ruie Lu , Hongyi Sun , Shiv Kumar , Yuan Wang , Mingqiang Gu , Meng Zeng , Yu-Jie Hao , Jiayu Li , Jifeng Shao , Xiao-Ming Ma , Zhanyang Hao , Ke Zhang , Wumiti Mansuer , Jiawei Mei , Yue Zhao , Cai Liu , Ke Deng , Wen Huang , Bing Shen , Kenya Shimada , Eike F. Schwier , Chang Liu , Qihang Liu , Chaoyu Chen

Topological magnets are a new family of quantum materials providing great potential to realize emergent phenomena, such as the quantum anomalous Hall effect and the axion-insulator state. Here, we present our discovery that the stoichiometric ferromagnet MnBi8Te13 with natural heterostructure MnBi2Te4/(Bi2Te3)3 is an unprecedented “half-magnetic topological insulator,” with the magnetization existing at the MnBi2Te4 surface but not at the opposite surface terminated by triple Bi2Te3 layers. Our angle-resolved photoemission spectroscopy measurements unveil a massive Dirac gap at the MnBi2Te4 surface and a gapless Dirac cone on the other side. Remarkably, the Dirac gap (about 28 meV) at the MnBi2Te4 surface decreases monotonically with increasing temperature and closes right at the Curie temperature, thereby representing the first smoking-gun spectroscopic evidence of a magnetization-induced topological surface gap among all known magnetic topological materials. We further demonstrate theoretically that the half-magnetic topological insulator is desirable to realize the surface anomalous Hall effect, which serves as direct proof of the general concept of axion electrodynamics in condensed matter systems.

中文翻译:

在选定表面具有磁化感应狄拉克间隙的半磁拓扑绝缘子

拓扑磁铁是一种新型的量子材料,为实现新兴现象(如量子反常霍尔效应和轴突-绝缘体状态)提供了巨大的潜力。在这里,我们介绍我们的发现,即化学计量的铁磁体锰铋813 具有天然异质结构 锰铋2个4/2个33 是史无前例的“半磁拓扑绝缘体”,其磁化强度存在于 锰铋2个4 表面,但不在相对的表面上以三元组终止 2个3层。我们的角度分辨光发射光谱仪测量结果揭示了Dirac的巨大缝隙锰铋2个4表面,另一侧是无间隙的狄拉克锥。值得注意的是,锰铋2个4表面随温度的升高而单调减小,并恰好在居里温度下闭合,从而代表了所有已知磁性拓扑材料之间磁化诱导的拓扑表面间隙的第一个吸烟枪光谱学证据。我们进一步从理论上证明,半磁拓扑绝缘体是实现表面异常霍尔效应所需要的,这可直接证明凝聚体系统中轴电动力学的一般概念。
更新日期:2021-02-25
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