Electronic States and Magnetic Response of MnBi2Te4 by Scanning Tunneling Microscopy and Spectroscopy

被引：91

作者：

Yuan, Yonghao ^{[1
,2
]}

Wang, Xintong ^{[1
]}

Li, Hao ^{[3
,4
]}

Li, Jiaheng ^{[1
]}

Ji, Yu ^{[1
]}

Hao, Zhenqi ^{[1
]}

Wu, Yang ^{[5
]}

He, Ke ^{[1
,2
]}

Wang, Yayu ^{[1
,2
]}

Xu, Yong ^{[1
,2
]}

Duan, Wenhui ^{[1
,2
]}

Li, Wei ^{[1
,2
]}

Xue, Qi-Kun ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[2] Frontier Sci Ctr Quantum Informat, Beijing 100084, Peoples R China

[3] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[4] Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Dept Phys, Beijing 100084, Peoples R China

[5] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China

来源：

NANO LETTERS | 2020年 / 20卷 / 05期

基金：

美国国家科学基金会;

关键词：

magnetic topological insulator; quantum anomalous Hall effect; magnetic dopants; scanning tunneling microscopy; layered structure; REALIZATION;

D O I：

10.1021/acs.nanolett.0c00031

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Exotic quantum phenomena have been demonstrated in recently discovered intrinsic magnetic topological insulator MnBi2Te4. At its two-dimensional limit, the quantum anomalous Hall effect and axion insulator state were observed in odd and even layers of MnBi2Te4, respectively. Here, we employ low-temperature scanning tunneling microscopy to study the electronic properties of MnBi2Te4. The quasiparticle interference patterns indicate that the electronic structures on the topmost layer of MnBi2Te4 are different from those of the expected out-of-plane A-type antiferromagnetic phase. The topological surface states may be embedded in deeper layers beneath the topmost surface. Such novel electronic structure is presumably related to the modification of crystalline structure during sample cleaving and reorientation of the magnetic moment of Mn atoms near the surface. Mn dopants substituted at the Bi site on the second atomic layer are observed. The electronic structures fluctuate at atomic scale on the surface, which can affect the magnetism of MnBi2Te4.

引用

页码：3271 / 3277

页数：7

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