Format

Send to

Choose Destination
Sci Rep. 2019 Feb 4;9(1):1331. doi: 10.1038/s41598-018-37663-8.

Observation of Restored Topological Surface States in Magnetically Doped Topological Insulator.

Author information

1
Department of Physics, Sogang University, Seoul, 04107, Korea.
2
Department of Physics, Sookmyung Women's University, Seoul, 04310, Korea.
3
Department of Applied Physics, Amity Institute of Applied Sciences, Amity University, Noida, 201303, India.
4
Pohang Accelerator Laboratory, Pohang, 37673, Korea.
5
Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon, 34113, Korea.
6
Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Korea.
7
Max Planck POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang, 37673, Korea.
8
Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang, 37673, Korea.
9
Department of Physics, Sookmyung Women's University, Seoul, 04310, Korea. hanchul@sookmyung.ac.kr.
10
Department of Physics, Sogang University, Seoul, 04107, Korea. mhjung@sogang.ac.kr.

Abstract

The introduction of ferromagnetic order in topological insulators in general breaks the time-reversal symmetry and a gap is opened in topological surface bands. Various studies have focused on gap-opened magnetic topological insulators, because such modified band structures provide a promising platform for observing exotic quantum physics. However, the role of antiferromagnetic order in topological insulators is still controversial. In this report, we demonstrate that it is possible to restore the topological surface states by effectively reducing the antiferromagnetic ordering in Gd-substituted Bi2Te3. We successfully control the magnetic impurities via thermal treatments in ultra-high vacuum condition and observe apparent restoration of topological surface band dispersions. The microscopic mechanism of atomic rearrangements and the restoration process of topological surface states are unraveled by the combination of scanning tunneling microscopy measurements and density functional theory calculations. This work provides an effective way to control the magnetic impurities which is strongly correlated with topological surface states.

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center