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Magnetic topological insulator MnBi6 Te10 with a zero-field ferromagnetic state and gapped Dirac surface states

Tian, Shangjie ; Gao, Shunye ; Nie, Simin ; Qian, Yuting ; Gong, Chunsheng ; Fu, Yang ; Li, Hang ; Fan, Wenhui ; Zhang, Peng and Kondo, Takesh , et al. (2020) In Physical Review B 102(3).
Abstract

Magnetic topological insulators (TIs) with nontrivial topological electronic structure and broken time-reversal symmetry exhibit various exotic topological quantum phenomena. The realization of such exotic phenomena at high temperature is one of the central topics in this area. We reveal that MnBi6Te10 is a magnetic TI with an antiferromagnetic ground state below 10.8 K whose nontrivial topology is manifested by Dirac-like surface states. The ferromagnetic axion insulator state with Z4=2 emerges once spins are polarized at a field as low as 0.1 T, accompanied with saturated anomalous Hall resistivity up to 10 K. Such a ferromagnetic state is preserved even with an external field down to zero at 2 K. Theoretical calculations indicate... (More)

Magnetic topological insulators (TIs) with nontrivial topological electronic structure and broken time-reversal symmetry exhibit various exotic topological quantum phenomena. The realization of such exotic phenomena at high temperature is one of the central topics in this area. We reveal that MnBi6Te10 is a magnetic TI with an antiferromagnetic ground state below 10.8 K whose nontrivial topology is manifested by Dirac-like surface states. The ferromagnetic axion insulator state with Z4=2 emerges once spins are polarized at a field as low as 0.1 T, accompanied with saturated anomalous Hall resistivity up to 10 K. Such a ferromagnetic state is preserved even with an external field down to zero at 2 K. Theoretical calculations indicate that the few-layer ferromagnetic MnBi6Te10 is also topologically nontrivial with a nonzero Chern number. Angle-resolved photoemission spectroscopy experiments further reveal three types of Dirac surface states arising from different terminations on the cleavage surfaces, one of which has insulating behavior with an energy gap of ∼28 meV at the Dirac point. These outstanding features suggest that MnBi6Te10 is a promising system to realize various topological quantum effects at zero field and high temperature.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
102
issue
3
article number
035144
publisher
American Physical Society
external identifiers
  • scopus:85089566107
ISSN
2469-9950
DOI
10.1103/PhysRevB.102.035144
language
English
LU publication?
yes
id
d2840097-6956-4af7-88a3-22183eaa25fb
date added to LUP
2020-08-27 14:16:36
date last changed
2022-04-19 00:23:39
@article{d2840097-6956-4af7-88a3-22183eaa25fb,
  abstract     = {{<p>Magnetic topological insulators (TIs) with nontrivial topological electronic structure and broken time-reversal symmetry exhibit various exotic topological quantum phenomena. The realization of such exotic phenomena at high temperature is one of the central topics in this area. We reveal that MnBi6Te10 is a magnetic TI with an antiferromagnetic ground state below 10.8 K whose nontrivial topology is manifested by Dirac-like surface states. The ferromagnetic axion insulator state with Z4=2 emerges once spins are polarized at a field as low as 0.1 T, accompanied with saturated anomalous Hall resistivity up to 10 K. Such a ferromagnetic state is preserved even with an external field down to zero at 2 K. Theoretical calculations indicate that the few-layer ferromagnetic MnBi6Te10 is also topologically nontrivial with a nonzero Chern number. Angle-resolved photoemission spectroscopy experiments further reveal three types of Dirac surface states arising from different terminations on the cleavage surfaces, one of which has insulating behavior with an energy gap of ∼28 meV at the Dirac point. These outstanding features suggest that MnBi6Te10 is a promising system to realize various topological quantum effects at zero field and high temperature. </p>}},
  author       = {{Tian, Shangjie and Gao, Shunye and Nie, Simin and Qian, Yuting and Gong, Chunsheng and Fu, Yang and Li, Hang and Fan, Wenhui and Zhang, Peng and Kondo, Takesh and Shin, Shik and Adell, Johan and Fedderwitz, Hanna and Ding, Hong and Wang, Zhijun and Qian, Tian and Lei, Hechang}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Magnetic topological insulator MnBi6 Te10 with a zero-field ferromagnetic state and gapped Dirac surface states}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.102.035144}},
  doi          = {{10.1103/PhysRevB.102.035144}},
  volume       = {{102}},
  year         = {{2020}},
}