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

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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• Visualizing the interplay of Dirac mass gap and magnetism at nanoscale in intrinsic magnetic topological insulators
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• Quantum Imaging of Magnetic Phase Transitions and Spin Fluctuations in Intrinsic Magnetic Topological Nanoflakes
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• Model studies of topological phase transitions in materials with two types of magnetic atoms
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