Gapless Dirac surface states in the antiferromagnetic topological insulator
Abstract
We used angle-resolved photoemission spectroscopy (ARPES) and density functional theory calculations to study the electronic properties of MnBi2 Te4, a material that was predicted to be an intrinsic antiferromagnetic (AFM) topological insulator. In striking contrast to earlier literature showing a full gap opening between two surface band manifolds on the (0001) surface, we observed a gapless Dirac surface state with a Dirac point sitting at EB = -280 meV . Furthermore, our ARPES data revealed the existence of a second Dirac cone sitting closer to the Fermi level. Surprisingly, these surface states remain intact across the AFM transition. The presence of gapless Dirac states in this material may be caused by different ordering at the surface from the bulk or weaker magnetic coupling between the bulk and surface. Whereas the surface Dirac cones seem to be remarkably insensitive to the AFM ordering most likely due to weak coupling to magnetism, we did observe a splitting of the bulk band accompanying the AFM transition. Finally, with a moderately high ordering temperature and interesting gapless Dirac surface states, MnBi2 Te4 provides a unique platform for studying the interplay between magnetic ordering and topology.
- Authors:
-
[1];
[3];
- Ames Lab., and Iowa State Univ., Ames, IA (United States)
- Ames Lab., Ames, IA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS); Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1616740
- Alternate Identifier(s):
- OSTI ID: 1615105; OSTI ID: 1649054
- Report Number(s):
- IS-J 9,990
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US2106654
- Grant/Contract Number:
- AC02-07CH11358; DMR-1420451; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 16; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; antiferromagnetism; electronic structure; topological materials; density functional calculations
Citation Formats
Swatek, Przemyslaw, Wu, Yun, Wang, Lin-Lin, Lee, Kyungchan, Schrunk, Benjamin, Yan, Jiaqiang, and Kaminski, Adam. Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4. United States: N. p., 2020.
Web. doi:10.1103/PhysRevB.101.161109.
Swatek, Przemyslaw, Wu, Yun, Wang, Lin-Lin, Lee, Kyungchan, Schrunk, Benjamin, Yan, Jiaqiang, & Kaminski, Adam. Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4. United States. https://doi.org/10.1103/PhysRevB.101.161109
Swatek, Przemyslaw, Wu, Yun, Wang, Lin-Lin, Lee, Kyungchan, Schrunk, Benjamin, Yan, Jiaqiang, and Kaminski, Adam. Thu .
"Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4". United States. https://doi.org/10.1103/PhysRevB.101.161109. https://www.osti.gov/servlets/purl/1616740.
@article{osti_1616740,
title = {Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4},
author = {Swatek, Przemyslaw and Wu, Yun and Wang, Lin-Lin and Lee, Kyungchan and Schrunk, Benjamin and Yan, Jiaqiang and Kaminski, Adam},
abstractNote = {We used angle-resolved photoemission spectroscopy (ARPES) and density functional theory calculations to study the electronic properties of MnBi2 Te4, a material that was predicted to be an intrinsic antiferromagnetic (AFM) topological insulator. In striking contrast to earlier literature showing a full gap opening between two surface band manifolds on the (0001) surface, we observed a gapless Dirac surface state with a Dirac point sitting at EB = -280 meV . Furthermore, our ARPES data revealed the existence of a second Dirac cone sitting closer to the Fermi level. Surprisingly, these surface states remain intact across the AFM transition. The presence of gapless Dirac states in this material may be caused by different ordering at the surface from the bulk or weaker magnetic coupling between the bulk and surface. Whereas the surface Dirac cones seem to be remarkably insensitive to the AFM ordering most likely due to weak coupling to magnetism, we did observe a splitting of the bulk band accompanying the AFM transition. Finally, with a moderately high ordering temperature and interesting gapless Dirac surface states, MnBi2 Te4 provides a unique platform for studying the interplay between magnetic ordering and topology.},
doi = {10.1103/PhysRevB.101.161109},
journal = {Physical Review B},
number = 16,
volume = 101,
place = {United States},
year = {Thu Apr 16 00:00:00 EDT 2020},
month = {Thu Apr 16 00:00:00 EDT 2020}
}
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