Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi$_2$Te$_4$

D. Nevola; H. X. Li; J. -Q. Yan; R. G. Moore; H. -N. Lee; H. Miao; P. D. Johnson

doi:10.1103/PhysRevLett.125.117205

Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi$_2$Te$_4$

Materials Science 2020-09-16 v1 Strongly Correlated Electrons

Authors: D. Nevola , H. X. Li , J. -Q. Yan , R. G. Moore , H. -N. Lee , H. Miao , P. D. Johnson

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Abstract

Surface magnetism and its correlation with the electronic structure are critical to understand the gapless topological surface state in the intrinsic magnetic topological insulator MnBi $_2$ Te $_4$ . Here, using static and time resolved angle-resolved photoemission spectroscopy (ARPES), we find a significant ARPES intensity change together with a gap opening on a Rashba-like conduction band. Comparison with a model simulation strongly indicates that the surface magnetism on cleaved MnBi $_2$ Te $_4$ is the same as its bulk state. The coexistence of surface ferromagnetism and a gapless TSS uncovers the novel complexity of MnBi $_2$ Te $_4$ that may be responsible for the low quantum anomalous Hall temperature of exfoliated MnBi $_2$ Te $_4$ .

Keywords

surface ferromagnetism gapless topological state MnBi2Te4 angle-resolved photoemission spectroscopy magnetic topological insulator quantum anomalous hall effect

Cite

@article{arxiv.2004.06895,
  title  = {Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi$_2$Te$_4$},
  author = {D. Nevola and H. X. Li and J. -Q. Yan and R. G. Moore and H. -N. Lee and H. Miao and P. D. Johnson},
  journal= {arXiv preprint arXiv:2004.06895},
  year   = {2020}
}

Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi$_2$Te$_4$

Abstract

Keywords

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