Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4

Swatek, Przemyslaw; Wu, Yun; Wang, Lin-Lin; Lee, Kyungchan; Schrunk, Benjamin; Yan, Jiaqiang; Kaminski, Adam

doi:10.1103/PhysRevB.101.161109

Gapless Dirac surface states in the antiferromagnetic topological insulator ${MnBi}_{2} {Te}_{4}$

Journal Article · Thu Apr 16 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.101.161109· OSTI ID:1616740

Swatek, Przemyslaw ^[1]; ^[1]; Wang, Lin-Lin ^[2]; Lee, Kyungchan ^[1]; Schrunk, Benjamin ^[1]; ^[3]; Kaminski, Adam ^[1]

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)

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 E_B = -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.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS); Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1616740

Alternate ID(s):: OSTI ID: 1615105
OSTI ID: 1649054

Report Number(s):: IS-J 9,990

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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