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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Cited by in corpus (12)

• Axion Electrodynamics in Topological Materials
• Sample-dependent Dirac point gap in MnBi${}_2$Te${}_4$ and its response to the applied surface charge: a combined photoemission and ab initio study
• Routes to realize the axion-insulator phase in MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ family: a perspective
• Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$
• Approaching a Minimal Topological Electronic Structure in Antiferromagnetic Topological Insulator MnBi2Te4 via Surface Modification
• Nonreciprocal transport in a bilayer of MnBi2Te4 and Pt
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Observation of magnetism induced topological edge state in antiferromagnetic topological insulator MnBi4Te7
• Facet dependent surface energy gap on magnetic topological insulators
• Absence of a Dirac gap in ferromagnetic Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• Defect Engineering for Stabilizing Magnetic and Topological Properties in Mn(Bi1-xSbx)2Te4