Origins of electronic bands in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$

Abstract

Despite the rapid progress in understanding the first intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$, its electronic structure remains a topic under debates. Here we perform a thorough spectroscopic investigation into the electronic structure of MnBi${}_2$Te${}_4$ via laser-based angle-resolved photoemission spectroscopy. Through quantitative analysis, we estimate an upper bound of 3 meV for the gap size of the topological surface state. Furthermore, our circular dichroism measurements reveal band chiralities for both the topological surface state and quasi-2D bands, which can be well reproduced in a band hybridization model. A numerical simulation of energy-momentum dispersions based on a four-band model with an additional step potential near the surface provides a promising explanation for the origin of the quasi-2D bands. Our study represents a solid step forward in reconciling the existing controversies in the electronic structure of MnBi${}_2$Te${}_4$, and provides an important framework to understand the electronic structures of other relevant topological materials MnBi${}_{2n}$Te${}_{3n+1}$.

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• Colloquium: Quantum anomalous Hall effect
• 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
• Light-induced topological phase transition with tunable layer Hall effect in axion antiferromagnets
• Delicate Ferromagnetism in MnBi${}_6$Te${}_{10}$
• Approaching a Minimal Topological Electronic Structure in Antiferromagnetic Topological Insulator MnBi2Te4 via Surface Modification
• Electrically Controlled Anomalous Hall Effect and Orbital Magnetization in Topological Magnet MnBi2Te4
• Ferromagnetic MnBi4Te7 obtained with low concentration Sb doping: A promising platform for exploring topological quantum states
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Evolution of the electronic structure of ultrathin MnBi2Te4 Films
• On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family
• An Integrated Quantum Material Testbed with Multi-Resolution Photoemission Spectroscopy
• Effect on the Electronic and Magnetic Properties of Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$ with Sn Doping
• Three-Dirac-fermion approach to unexpected universal gapless surface states of van der Waals magnetic topological insulators
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• Surface state evolution induced by magnetic order in axion insulator candidate EuIn2As2
• Toward improved property prediction of 2D materials using many-body quantum Monte Carlo methods
• Extracting unconventional spin texture in two dimensional topological crystalline insulator bismuthene via tuning bulk-edge interactions
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• The electronic structure of Mn${}_{1-x}$Pb${}_x$Bi${}_2$Te${}_4$: experimental evidence of topological phase transition
• Realization of a three-dimensional quantum Hall effect in a Zeeman-induced second order topological insulator on a torus
• Spectroscopic evidence of intra-unit-cell charge redistribution in charge-neutral magnetic topological insulator Sb-doped MnBi6Te10
• Detecting axion dynamics on the surface of magnetic topological insulators
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
• Resonantly enhanced photoemission from topological surface states in MnBi${}_6$Te${}_{10}$
• Hedgehog-like spin texture in Sb-doped MnBi${}_2$Te${}_4$