Distinct Topological Surface States on the Two Terminations of MnBi${}_4$Te${}_7$

Abstract

The recent discovered intrinsic magnetic topological insulator MnBi2Te4 have been met with unusual success in hosting emergent phenomena such as the quantum anomalous Hall effect and the axion insulator states. However, the surface-bulk correspondence of the Mn-Bi-Te family, composed by the superlattice-like MnBi2Te4/(Bi2Te3)n (n = 0, 1, 2, 3 ...) layered structure, remains intriguing but elusive. Here, by using scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES) techniques, we unambiguously assign the two distinct surface states of MnBi4Te7 (n = 1) to the quintuple-layer (QL) Bi2Te3 termination and the septuple-layer (SL) MnBi2Te4 termination, respectively. A comparison of the experimental observations with theoretical calculations reveals the diverging topological behaviors, especially the hybridization effect between magnetic and nonmagnetic layers, on the two terminations: a gap on the QL termination originating from the topological surface states of the QL hybridizing with the bands of the beneath SL, and a gapless Dirac-cone band structure on the SL termination with time-reversal symmetry. The quasi-particle interference patterns further confirm the topological nature of the surface states for both terminations, continuing far above the Fermi energy. The QL termination carries a spin-helical Dirac state with hexagonal warping, while at the SL termination, a strongly canted helical state from the surface lies between a pair of Rashba-split states from its neighboring layer. Our work elucidates an unprecedented hybridization effect between the building blocks of the topological surface states, and also reveals the termination-dependent time-reversal symmetry breaking in a magnetic topological insulator, rendering an ideal platform to realize the half-integer quantum Hall effect and relevant quantum phenomena.

arXiv comment22 Pages, 4 Figures

References in corpus (31)

• Topological Insulators
• 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
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
• 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
• Unique thickness-dependent properties of the van der Waals interlayer antiferromagnet $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$ films
• Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+d
• STM imaging of electronic waves on the surface of Bi${}_2$Te${}_3$: topologically protected surface states and hexagonal warping effects
• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
• Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Crystal growth and magnetic structure of MnBi2Te4
• Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
• Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
• Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
• Emergent quantum confinement at topological insulator surfaces
• Large magnetic gap at the Dirac point in a Mn-induced Bi${}_2$Te${}_3$ heterostructure
• A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling
• Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
• Natural van der Waals heterostructural single crystals with both magnetic and topological properties
• Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4
• 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
• Coexistence of Magnetic Orders in Two-Dimensional Magnet CrI${}_3$
• Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments

Cited by in corpus (43)

• Colloquium: Quantum anomalous Hall effect
• Axion Electrodynamics in Topological Materials
• Site Mixing for Engineering Magnetic Topological Insulators
• Half-Magnetic Topological Insulator
• Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi${}_4$Te${}_7$ and MnBi${}_6$Te${}_{10}$
• Multiple magnetic topological phases in bulk van der Waals crystal MnSb4Te7
• Routes to realize the axion-insulator phase in MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ family: a perspective
• Origins of electronic bands in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Pressure-tuned intralayer exchange in superlattice-like MnBi2Te4/(Bi2Te3)n topological insulators
• Distinct magnetic gaps between antiferromagnetic and ferromagnetic orders driven by surface defects in the topological magnet MnBi2Te4
• Spectroscopic realization of large surface gap in a doped magnetic topological insulator
• 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)
• Visualizing the interplay of Dirac mass gap and magnetism at nanoscale in intrinsic magnetic topological insulators
• Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$
• Higher-order Fabry-Pérot Interferometer from Topological Hinge States
• Coexistence of Ferromagnetism and Topology by Charge Carrier Engineering in intrinsic magnetic topological insulator MnBi4Te7
• Accessing the spectral function of in operando devices by angle-resolved photoemission spectroscopy
• Delicate Ferromagnetism in MnBi${}_6$Te${}_{10}$
• Strongly anisotropic spin dynamics in magnetic topological insulators
• Ferromagnetic MnBi4Te7 obtained with low concentration Sb doping: A promising platform for exploring topological quantum states
• 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
• Ferroelectrically switchable magnetic multistates in MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ and MnSb${}_2$Te${}_4$(Sb${}_2$Te${}_3$)${}_n$ (n = 0, 1) thin films
• An Integrated Quantum Material Testbed with Multi-Resolution Photoemission Spectroscopy
• Direct visualization of surface spin-flip transition in MnBi4Te7
• Hinge Spin Polarization in Magnetic Topological Insulators Revealed by Resistance Switch
• Koopmans' theorem as the mechanism of nearly gapless surface states in self-doped magnetic topological insulators
• Magnetic warping in topological insulators
• Momentum-inversion symmetry breaking on the Fermi surface of magnetic topological insulators
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• Magnetic topological transistor exploiting layer-selective transport
• Facet dependent surface energy gap on magnetic topological insulators
• A Dirac-fermion approach and its application to design high Chern numbers in magnetic topological insulator multilayers
• Atomic-Layer-Controlled Magnetic Orders in MnBi2Te4-Bi2Te3 Topological Heterostructures
• Symmetry-driven anisotropic coupling effect in antiferromagnetic topological insulator: Mechanism for high-Chern-number quantum anomalous Hall state
• Large-gap quantum anomalous Hall states induced by functionalizing buckled Bi-III monolayer/Al${}_2$O${}_3$
• Computational studies on magnetism and ferroelectricity
• A sample-position-autocorrection system with precision better than 1 \um~in angle-resolved photoemission experiments
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
• Fate of surface gaps in magnetic topological insulators
• Conductance oscillations of antiferromagnetic layer tunnel junctions
• Defect-induced displacement of topological surface state in quantum magnet MnBi${}_2$Te${}_4$