Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator
Abstract
Room-temperature realization of macroscopic quantum phases is one of the major pursuits in fundamental physics. The quantum spin Hall phase is a topological quantum phase that features a two-dimensional insulating bulk and a helical edge state. Here we use vector magnetic field and variable temperature based scanning tunnelling microscopy to provide micro-spectroscopic evidence for a room-temperature quantum spin Hall edge state on the surface of the higher-order topological insulator Bi4Br4. Here, we find that the atomically resolved lattice exhibits a large insulating gap of over 200 meV, and an atomically sharp monolayer step edge hosts an in-gap gapless state, suggesting topological bulk–boundary correspondence. An external magnetic field can gap the edge state, consistent with the time-reversal symmetry protection inherent in the underlying band topology. We further identify the geometrical hybridization of such edge states, which not only supports the Z2 topology of the quantum spin Hall state but also visualizes the building blocks of the higher-order topological insulator phase. Our results further encourage the exploration of high-temperature transport quantization of the putative topological phase reported here.
- Authors:
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[1];
[2];
[1];
[3];
[1];
[1];
[7];
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- Princeton Univ., NJ (United States)
- Beijing Inst. of Technology (China)
- Univ. of Texas at Dallas, Richardson, TX (United States); Seoul National Univ. (Korea)
- National Taiwan Univ., Taipei (Taiwan)
- National High Magnetic Field Lab., Tallahassee, FL (United States)
- National Cheng Kung Univ., Tainan (Taiwan); Center for Quantum Frontiers of Research and Technology (QFort), Tainan (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
- Univ. of Zürich (Switzerland)
- Peking Univ., Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Beijing Academy of Quantum Information Sciences (China)
- Academia Sinica, Taipei (Taiwan)
- Univ. of Texas at Dallas, Richardson, TX (United States)
- Princeton Univ., NJ (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Quantum Science Center, Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Army Research Office (ARO); National Science Foundation of China (NSFC)
- OSTI Identifier:
- 1877193
- Grant/Contract Number:
- SC0002613; FG02-05ER46200; DMR-1921581; DMR-1945351; DMR-2105139; W911NF-18-1-0416; 92065109; 11734003; 12061131002
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Materials
- Additional Journal Information:
- Journal Volume: 21; Journal ID: ISSN 1476-1122
- Publisher:
- Springer Nature
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; higher order topological insulator; scanning tunneling microscopy; edge states
Citation Formats
Shumiya, Nana, Hossain, Md Shafayat, Yin, Jia-Xin, Wang, Zhiwei, Litskevich, Maksim, Yoon, Chiho, Li, Yongkai, Yang, Ying, Jiang, Yu-Xiao, Cheng, Guangming, Lin, Yen-Chuan, Zhang, Qi, Cheng, Zi-Jia, Cochran, Tyler A., Multer, Daniel, Yang, Xian P., Casas, Brian, Chang, Tay-Rong, Neupert, Titus, Yuan, Zhujun, Jia, Shuang, Lin, Hsin, Yao, Nan, Balicas, Luis, Zhang, Fan, Yao, Yugui, and Hasan, M. Zahid. Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator. United States: N. p., 2022.
Web. doi:10.1038/s41563-022-01304-3.
Shumiya, Nana, Hossain, Md Shafayat, Yin, Jia-Xin, Wang, Zhiwei, Litskevich, Maksim, Yoon, Chiho, Li, Yongkai, Yang, Ying, Jiang, Yu-Xiao, Cheng, Guangming, Lin, Yen-Chuan, Zhang, Qi, Cheng, Zi-Jia, Cochran, Tyler A., Multer, Daniel, Yang, Xian P., Casas, Brian, Chang, Tay-Rong, Neupert, Titus, Yuan, Zhujun, Jia, Shuang, Lin, Hsin, Yao, Nan, Balicas, Luis, Zhang, Fan, Yao, Yugui, & Hasan, M. Zahid. Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator. United States. https://doi.org/10.1038/s41563-022-01304-3
Shumiya, Nana, Hossain, Md Shafayat, Yin, Jia-Xin, Wang, Zhiwei, Litskevich, Maksim, Yoon, Chiho, Li, Yongkai, Yang, Ying, Jiang, Yu-Xiao, Cheng, Guangming, Lin, Yen-Chuan, Zhang, Qi, Cheng, Zi-Jia, Cochran, Tyler A., Multer, Daniel, Yang, Xian P., Casas, Brian, Chang, Tay-Rong, Neupert, Titus, Yuan, Zhujun, Jia, Shuang, Lin, Hsin, Yao, Nan, Balicas, Luis, Zhang, Fan, Yao, Yugui, and Hasan, M. Zahid. Thu .
"Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator". United States. https://doi.org/10.1038/s41563-022-01304-3. https://www.osti.gov/servlets/purl/1877193.
@article{osti_1877193,
title = {Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator},
author = {Shumiya, Nana and Hossain, Md Shafayat and Yin, Jia-Xin and Wang, Zhiwei and Litskevich, Maksim and Yoon, Chiho and Li, Yongkai and Yang, Ying and Jiang, Yu-Xiao and Cheng, Guangming and Lin, Yen-Chuan and Zhang, Qi and Cheng, Zi-Jia and Cochran, Tyler A. and Multer, Daniel and Yang, Xian P. and Casas, Brian and Chang, Tay-Rong and Neupert, Titus and Yuan, Zhujun and Jia, Shuang and Lin, Hsin and Yao, Nan and Balicas, Luis and Zhang, Fan and Yao, Yugui and Hasan, M. Zahid},
abstractNote = {Room-temperature realization of macroscopic quantum phases is one of the major pursuits in fundamental physics. The quantum spin Hall phase is a topological quantum phase that features a two-dimensional insulating bulk and a helical edge state. Here we use vector magnetic field and variable temperature based scanning tunnelling microscopy to provide micro-spectroscopic evidence for a room-temperature quantum spin Hall edge state on the surface of the higher-order topological insulator Bi4Br4. Here, we find that the atomically resolved lattice exhibits a large insulating gap of over 200 meV, and an atomically sharp monolayer step edge hosts an in-gap gapless state, suggesting topological bulk–boundary correspondence. An external magnetic field can gap the edge state, consistent with the time-reversal symmetry protection inherent in the underlying band topology. We further identify the geometrical hybridization of such edge states, which not only supports the Z2 topology of the quantum spin Hall state but also visualizes the building blocks of the higher-order topological insulator phase. Our results further encourage the exploration of high-temperature transport quantization of the putative topological phase reported here.},
doi = {10.1038/s41563-022-01304-3},
journal = {Nature Materials},
number = ,
volume = 21,
place = {United States},
year = {Thu Jul 14 00:00:00 EDT 2022},
month = {Thu Jul 14 00:00:00 EDT 2022}
}
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