Experimental observation of gapped topological surface states in Sb-doped MnBi4Te7

Author:

Qiao Yuxi12ORCID,Jiang Zhicheng13,Chen Bo4,Tao Zicheng5ORCID,Liu Zhonghao6ORCID,Zhang Fayuan7,Cho Soohyun3ORCID,Liu Zhengtai18,Guo Yanfeng59ORCID,Song Fengqi4ORCID,Fei Fucong10ORCID,Liu Jishan18ORCID,Shen Dawei3ORCID

Affiliation:

1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences 1 , Shanghai 200050, China

2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences 2 , Beijing 100049, China

3. National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China 3 , Hefei 230026, China

4. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and College of Physics, Nanjing University 4 , Nanjing 210093, China

5. School of Physical Science and Technology, ShanghaiTech University 5 , Shanghai 201210, China

6. Institute of High-Pressure Physics & School of Physical Science and Technology, Ningbo University 6 , Ningbo 315211, China

7. Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology 7 , Shenzhen 518055, China

8. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences 8 , Shanghai 201210, China

9. ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University 9 , Shanghai 201210, China

10. School of Materials Science and Intelligent Engineering, Nanjing University 10 , Suzhou 215163, China

Abstract

The realization of intrinsic magnetic topological insulators offers an ideal platform to investigate high-temperature quantum anomalous Hall effect as well as quantum devices. The family of MnBi2Te4(Bi2Te3)n has been confirmed that it belongs to this system. However, whether there is a bandgap in the surface states remains controversial. In this work, the ferromagnetism in Sb-doped MnBi4Te7 is confirmed by magnetic transport. Utilizing angle-resolved photoemission spectroscopy, we demonstrate the nontrivial topology in Mn(Bi0.7Sb0.3)4Te7 with an energy gap on the MnBi2Te4 termination. As well, we detect distinct topological surface states on two different terminations. Our results provide spectral evidence of an energy gap in the topological surface states.

Funder

National Natural Science Foundation of China

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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