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

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

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

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arxiv 2004.06895 v1 pith:JGWBZ5J6 submitted 2020-04-15 cond-mat.mtrl-sci cond-mat.str-el

D. Nevola , H. X. Li , J.-Q. Yan , R. G. Moore , H.-N. Lee , H. Miao , P. D. Johnson This is my paper · ORCID

classification cond-mat.mtrl-scicond-mat.str-el

keywords mnbisurfacegaplessstatetopologicalarpescoexistenceferromagnetism

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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$_4$.

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