Mapping the Dirac fermions in intrinsic antiferromagnetic topological insulators (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_n$ (n=0, 1)

Abstract

Topological surface states with intrinsic magnetic ordering in the MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ compounds have been predicted to host rich topological phenomena including quantized anomalous Hall effect and axion insulator state. Here we use scanning tunneling microscopy to image the surface Dirac fermions in MnBi${}_2$Te${}_4$ and MnBi${}_4$Te${}_7$. We have determined the energy dispersion and helical spin texture of the surface states through quasiparticle interference patterns far above Dirac energy, which confirms its topological nature. Approaching the Dirac point, the native defects in the MnBi${}_2$Te${}_4$ septuple layer give rise to resonance states which extend spatially and potentially hinder the detection of a mass gap in the spectra. Our results demonstrate that regulating defects is essential to realize exotic topological states at higher temperatures in these compounds.

arXiv comment10 pages, 5 figures

References in corpus (40)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Prediction and observation of the first antiferromagnetic topological insulator
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
• Hexagonal Warping Effects in the Surface States of Topological Insulator Bi${}_2$Te${}_3$
• Experimental demonstration of the topological surface states protected by the time-reversal symmetry
• Experimental realization of an intrinsic magnetic topological insulator
• Magnetic impurities on the surface of a topological insulator
• Discovery of a quantum limit Chern magnet TbMn6Sn6
• Chiral Majorana edge state in a quantum anomalous Hall insulator-superconductor structure
• Realization of the Axion Insulator State in Quantum Anomalous Hall Sandwich Heterostructures
• Crystal growth and magnetic structure of MnBi2Te4
• Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
• Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
• Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes
• Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
• Chemical Aspects of the Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Large magnetic gap at the Dirac point in a Mn-induced Bi${}_2$Te${}_3$ heterostructure
• Intrinsic Quantum Anomalous Hall Effect in the Kagome Lattice Cs2LiMn3F12
• Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
• A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling
• Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$
• Natural van der Waals heterostructural single crystals with both magnetic and topological properties
• Impurity-induced states on the surface of 3D topological insulators
• Imaging Cooper Pairing of Heavy Fermions in CeCoIn5
• Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4
• Fermi Level Tuning of Epitaxial Sb2Te3 Thin Films on Graphene by Regulating Intrinsic Defects and Substrate Transfer Doping
• Rational design principles of quantum anomalous Hall effect from superlattice-like magnetic topological insulators
• Topological electronic structure and intrinsic magnetization in MnBi${}_4$Te${}_7$: a Bi${}_2$Te${}_3$-derivative with a periodic Mn sublattice
• Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi${}_2$Te${}_4$
• Magnetic and transport properties in magnetic topological insulators MnBi2Te4(Bi2Te3)n (n=1,2)
• STM imaging of impurity resonances on Bi${}_2$Se${}_3$
• Power-Law Decay of Standing Waves on the Surface of Topological Insulators
• Distinct Topological Surface States on the Two Terminations of MnBi${}_4$Te${}_7$
• Dual nature of magnetic dopants and competing trends in topological insulators
• Universal gapless Dirac cone and tunable topological states in (MnBi${}_2$Te${}_4$)${}_m$(Bi${}_2$Te${}_3$)${}_n$ heterostructures

Cited by in corpus (19)

• Colloquium: Quantum anomalous Hall effect
• Variety of magnetic topological phases in the (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_m$ family
• Site Mixing for Engineering Magnetic Topological Insulators
• Defect-driven ferrimagnetism and hidden magnetization in MnBi${}_2$Te${}_4$
• 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
• Native Defects in Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Analytical solution for the surface states of antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Hybridization-Induced Gapped and Gapless States on the Surfaces of Magnetic Topological Insulators
• Visualizing the interplay of Dirac mass gap and magnetism at nanoscale in intrinsic magnetic topological insulators
• Unusual Magnetic Properties in Layered Magnetic Topological Insulator EuSn2As2
• Local manifestations of thickness dependent topology and axion edge state in topological magnet MnBi${}_2$Te${}_4$
• Approaching a Minimal Topological Electronic Structure in Antiferromagnetic Topological Insulator MnBi2Te4 via Surface Modification
• On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family
• Observation of magnetism induced topological edge state in antiferromagnetic topological insulator MnBi4Te7
• Koopmans' theorem as the mechanism of nearly gapless surface states in self-doped magnetic topological insulators
• Three-Dirac-fermion approach to unexpected universal gapless surface states of van der Waals magnetic topological insulators
• Toward improved property prediction of 2D materials using many-body quantum Monte Carlo methods
• Direct observation of chiral edge current at zero magnetic field in odd-layer MnBi${}_2$Te${}_4$
• Axion insulator, Weyl points, quantum anomalous Hall effect and magnetic topological phase transition in Eu3In2As4