Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator
Abstract
The recently discovered antiferromagnetic topological insulators in the Mn-Bi-Te family with intrinsic magnetic ordering have rapidly drawn broad interest since its cleaved surface state is believed to be gapped, hosting the unprecedented axion states with a half-integer quantum Hall effect. Here, however, we show unambiguously by using high-resolution angle resolved photoemission spectroscopy that a gapless Dirac cone at the (0001) surface of MnBi2Te4 exists inside the bulk band gap. Such an unexpected surface state remains unchanged across the bulk N´eel temperature, and is even robust against severe surface degradation, indicating additional topological protection. Through symmetry analysis and ab initio calculations we consider different types of surface reconstruction of the magnetic moments as possible origins giving rise to such linear dispersion. Our results unveil the experimental topological properties of MnBi2Te4, revealing that the intrinsic magnetic topological insulator hosts a rich platform to realize various topological phases by tuning the magnetic or structural configurations, and thus push forward the comprehensive understanding of magnetic topological materials.
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- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1595174
- Alternate Identifier(s):
- OSTI ID: 1802300
- Grant/Contract Number:
- SC0011978; 19AG014; 19AG004; 2019B030301001; ZDSYS20170303165926217; JCYJ20150630145302240; KYTDPT20181011104202253
- Resource Type:
- Published Article
- Journal Name:
- Physical Review. X
- Additional Journal Information:
- Journal Name: Physical Review. X Journal Volume: 9 Journal Issue: 4; Journal ID: ISSN 2160-3308
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics
Citation Formats
Hao, Yu-Jie, Liu, Pengfei, Feng, Yue, Ma, Xiao-Ming, Schwier, Eike F., Arita, Masashi, Kumar, Shiv, Hu, Chaowei, Lu, Rui’e, Zeng, Meng, Wang, Yuan, Hao, Zhanyang, Sun, Hong-Yi, Zhang, Ke, Mei, Jiawei, Ni, Ni, Wu, Liusuo, Shimada, Kenya, Chen, Chaoyu, Liu, Qihang, and Liu, Chang. Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator MnBi 2 Te 4. United States: N. p., 2019.
Web. doi:10.1103/PhysRevX.9.041038.
Hao, Yu-Jie, Liu, Pengfei, Feng, Yue, Ma, Xiao-Ming, Schwier, Eike F., Arita, Masashi, Kumar, Shiv, Hu, Chaowei, Lu, Rui’e, Zeng, Meng, Wang, Yuan, Hao, Zhanyang, Sun, Hong-Yi, Zhang, Ke, Mei, Jiawei, Ni, Ni, Wu, Liusuo, Shimada, Kenya, Chen, Chaoyu, Liu, Qihang, & Liu, Chang. Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator MnBi 2 Te 4. United States. https://doi.org/10.1103/PhysRevX.9.041038
Hao, Yu-Jie, Liu, Pengfei, Feng, Yue, Ma, Xiao-Ming, Schwier, Eike F., Arita, Masashi, Kumar, Shiv, Hu, Chaowei, Lu, Rui’e, Zeng, Meng, Wang, Yuan, Hao, Zhanyang, Sun, Hong-Yi, Zhang, Ke, Mei, Jiawei, Ni, Ni, Wu, Liusuo, Shimada, Kenya, Chen, Chaoyu, Liu, Qihang, and Liu, Chang. Thu .
"Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator MnBi 2 Te 4". United States. https://doi.org/10.1103/PhysRevX.9.041038.
@article{osti_1595174,
title = {Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator MnBi 2 Te 4},
author = {Hao, Yu-Jie and Liu, Pengfei and Feng, Yue and Ma, Xiao-Ming and Schwier, Eike F. and Arita, Masashi and Kumar, Shiv and Hu, Chaowei and Lu, Rui’e and Zeng, Meng and Wang, Yuan and Hao, Zhanyang and Sun, Hong-Yi and Zhang, Ke and Mei, Jiawei and Ni, Ni and Wu, Liusuo and Shimada, Kenya and Chen, Chaoyu and Liu, Qihang and Liu, Chang},
abstractNote = {The recently discovered antiferromagnetic topological insulators in the Mn-Bi-Te family with intrinsic magnetic ordering have rapidly drawn broad interest since its cleaved surface state is believed to be gapped, hosting the unprecedented axion states with a half-integer quantum Hall effect. Here, however, we show unambiguously by using high-resolution angle resolved photoemission spectroscopy that a gapless Dirac cone at the (0001) surface of MnBi2Te4 exists inside the bulk band gap. Such an unexpected surface state remains unchanged across the bulk N´eel temperature, and is even robust against severe surface degradation, indicating additional topological protection. Through symmetry analysis and ab initio calculations we consider different types of surface reconstruction of the magnetic moments as possible origins giving rise to such linear dispersion. Our results unveil the experimental topological properties of MnBi2Te4, revealing that the intrinsic magnetic topological insulator hosts a rich platform to realize various topological phases by tuning the magnetic or structural configurations, and thus push forward the comprehensive understanding of magnetic topological materials.},
doi = {10.1103/PhysRevX.9.041038},
journal = {Physical Review. X},
number = 4,
volume = 9,
place = {United States},
year = {Thu Nov 21 00:00:00 EST 2019},
month = {Thu Nov 21 00:00:00 EST 2019}
}
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https://doi.org/10.1103/PhysRevX.9.041038
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