Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes.,Nature Communications

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Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes.
Nature Communications ( IF 14.7 ) Pub Date : 2019-10-02 , DOI: 10.1038/s41467-019-12485-y
Bo Chen _{1,

2} , Fucong Fei _{1,

2} , Dongqin Zhang ₁ , Bo Zhang ₃ , Wanling Liu _{4,

5,

6} , Shuai Zhang _{1,

2} , Pengdong Wang ₃ , Boyuan Wei _{1,

2} , Yong Zhang _{1,

2} , Zewen Zuo _{1,

2} , Jingwen Guo _{1,

2} , Qianqian Liu _{1,

2} , Zilu Wang ₇ , Xuchuan Wu ₇ , Junyu Zong ₁ , Xuedong Xie ₁ , Wang Chen ₁ , Zhe Sun ₃ , Shancai Wang ₇ , Yi Zhang ₁ , Minhao Zhang _{1,

2} , Xuefeng Wang _{2,

8} , Fengqi Song _{1,

2} , Haijun Zhang ₁ , Dawei Shen _{5,

6} , Baigeng Wang ₁

Affiliation

National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and College of Physics, Nanjing University, 210093, Nanjing, China.
Atomic Manufacture Institute (AMI), 211805, Nanjing, China.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, 230029, Hefei, China.
Division of Photon Science and Condensed Matter Physics, School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China.
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences, 200050, Shanghai, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China.
Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, 100872, Beijing, China.
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Electronic Science and Engineering, Nanjing University, 210093, Nanjing, China.

Magnetic topological insulators (MTIs) offer a combination of topologically nontrivial characteristics and magnetic order and show promise in terms of potentially interesting physical phenomena such as the quantum anomalous Hall (QAH) effect and topological axion insulating states. However, the understanding of their properties and potential applications have been limited due to a lack of suitable candidates for MTIs. Here, we grow two-dimensional single crystals of Mn(SbxBi(1-x))2Te4 bulk and exfoliate them into thin flakes in order to search for intrinsic MTIs. We perform angle-resolved photoemission spectroscopy, low-temperature transport measurements, and first-principles calculations to investigate the band structure, transport properties, and magnetism of this family of materials, as well as the evolution of their topological properties. We find that there exists an optimized MTI zone in the Mn(SbxBi(1-x))2Te4 phase diagram, which could possibly host a high-temperature QAH phase, offering a promising avenue for new device applications.

中文翻译：

Sb 掺杂 MnBi2Te4 块体和薄片中的本征磁拓扑绝缘体相。

磁拓扑绝缘体（MTIs）提供了拓扑非平凡特性和磁序的组合，并在量子反常霍尔（QAH）效应和拓扑轴子绝缘态等潜在有趣的物理现象方面显示出前景。然而，由于缺乏合适的 MTI 候选者，对其特性和潜在应用的了解受到限制。在这里，我们生长了 Mn(SbxBi(1-x))2Te4 块体的二维单晶，并将它们剥离成薄片，以寻找内在的 MTI。我们进行角分辨光电子能谱、低温输运测量和第一原理计算，以研究该材料家族的能带结构、输运特性和磁性，以及其拓扑特性的演变。我们发现Mn(SbxBi(1-x))2Te4相图中存在一个优化的MTI区，该区可能存在高温QAH相，为新器件应用提供了一条有希望的途径。

更新日期：2019-10-02

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