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

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$_4$.

preprint2020arXivOpen access
D. NevolaH. X. LiJ. -Q. YanR. G. MooreH. -N. LeeH. MiaoP. D. Johnson
cond-mat.str-elcond-mat.mtrl-sci
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D. NevolaH. X. LiJ. -Q. YanR. G. MooreH. -N. LeeH. MiaoP. D. Johnson

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