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Title: Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi 2 Te 4

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]; ORCiD logo [1];  [2];  [1];  [1]; ORCiD logo [3];  [1]
  1. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
  3. 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 Lab., Ames, IA (United States); Oak Ridge National Lab. (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
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. doi: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. doi: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 = {2020},
month = {4}
}

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