Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1

Abstract

In magnetic topological insulators (TIs), the interplay between magnetic order and nontrivial topology can induce fascinating topological quantum phenomena, such as the quantum anomalous Hall effect, chiral Majorana fermions and axion electrodynamics. Recently, a great deal of attention has been focused on the intrinsic magnetic TIs, where disorder effects can be eliminated to a large extent, which is expected to facilitate the emergence of topological quantum phenomena. In despite of intensive efforts, experimental evidence of the topological surface states (SSs) remains elusive. Here, by combining first-principles calculations and angle-resolved photoemission spectroscopy (ARPES) experiments, we have revealed that EuSn2As2 is an antiferromagnetic TI with observation of Dirac SSs consistent with our prediction. We also observe nearly gapless Dirac SSs in antiferromagnetic TIs MnBi2nTe3n+1 (n = 1 and 2), which were absent in previous ARPES results. These results provide clear evidence for nontrivial topology of these intrinsic magnetic TIs. Furthermore, we find that the topological SSs show no observable changes across the magnetic transition within the experimental resolution, indicating that the magnetic order has quite small effect on the topological SSs, which can be attributed to weak hybridization between the localized magnetic moments, from either 4f or 3d orbitals, and the topological electronic states. This provides insights for further research that the correlations between magnetism and topological states need to be strengthened to induce larger gaps in the topological SSs, which will facilitate the realization of topological quantum phenomena at higher temperatures.

arXiv comment22 pages, 5 figures, to be published in PRX

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• Antiferromagnetic topological insulators
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• Higher-order Topology of Axion Insulator EuIn${}_2$As${}_2$
• Spin Hall Insulator
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• Crystal growth and magnetic structure of MnBi2Te4
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• Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes
• Chemical Aspects of the Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
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• Evolution of structural, magnetic and transport properties in MnBi2-xSbxTe4
• Surface states and Rashba-type spin polarization in antiferromagnetic MnBi${}_2$Te${}_4$
• Rational design principles of quantum anomalous Hall effect from superlattice-like magnetic topological insulators
• Magnetically Controllable Topological Quantum Phase Transitions in Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Quantum anomalous Hall effect in magnetic topological insulators
• Suppression of the antiferromagnetic metallic state in the pressurized MnBi2Te4 single crystal
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Cited by in corpus (146)

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• Colloquium: Quantum anomalous Hall effect
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• Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
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• Axion Electrodynamics in Topological Materials
• Möbius Insulator and Higher-Order Topology in MnBi${}_{2n}$Te${}_{3n+1}$
• Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4
• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Topological electronic structure and intrinsic magnetization in MnBi${}_4$Te${}_7$: a Bi${}_2$Te${}_3$-derivative with a periodic Mn sublattice
• A-type Antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals
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• Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
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• Topological Semimetal Nanostructures: From Properties to Topotronics
• Intrinsic axion insulating behavior in antiferromagnetic MnBi${}_6$Te${}_{10}$
• Magnetic topological insulator MnBi6Te10 with zero-field ferromagnetic state and gapped Dirac surface states
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• In-plane antiferromagnetic moments in axion topological insulator candidate EuIn${}_2$As${}_2$
• Flat Chern Band From Twisted Bilayer MnBi${}_2$Te${}_4$
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• Topological magnetic materials of the (MnSb${}_2$Te${}_4$)$\cdot$(Sb${}_2$Te${}_3$)${}_n$ van der Waals compounds family
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• Multiple magnetic topological phases in bulk van der Waals crystal MnSb4Te7
• Analytical solution for the surface states of antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
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• Spectroscopic realization of large surface gap in a doped magnetic topological insulator
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• Hybridization-Induced Gapped and Gapless States on the Surfaces of Magnetic Topological Insulators
• Mapping the Dirac fermions in intrinsic antiferromagnetic topological insulators (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_n$ (n=0, 1)
• Realizing gapped surface states in magnetic topological insulator MnBi${}_{2-x}$Sb${}_x$Te${}_4$
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• Unusual Magnetic Properties in Layered Magnetic Topological Insulator EuSn2As2
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• Recent advancements in the study of intrinsic magnetic topological insulators and magnetic Weyl semimetals
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• Engineering magnetic topological insulators in Eu${}_5{M}_2{X}_6$ Zintls
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• Evolution of the electronic structure of ultrathin MnBi2Te4 Films
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• Identifying Axion Insulator by Quantized Magnetoelectric Effect in Antiferromagnetic ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$ Tunnel Junction
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• Spectral features of magnetic domain walls on surface of 3D topological insulators
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• Axion insulators protected by C2T and their K-theory invariants and material realization
• Development of a Laser-based angle-resolved-photoemission spectrometer with sub-micrometer spatial resolution and high-efficiency spin detection
• Absence of a Dirac gap in ferromagnetic Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
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