Half-Magnetic Topological Insulator

Abstract

Topological magnets are a new family of quantum materials providing great potential to realize emergent phenomena, such as quantum anomalous Hall effect and axion-insulator state. Here we present our discovery that stoichiometric ferromagnet MnBi8Te13 with natural heterostructure MnBi2Te4-(Bi2Te3)3 is an unprecedented half-magnetic topological insulator, with the magnetization existing at the MnBi2Te4 surface but not at the opposite surface terminated by triple Bi2Te3 layers. Our angle-resolved photoemission spectroscopy measurements unveil a massive Dirac gap at the MnBi2Te4 surface, and gapless Dirac cone on the other side. Remarkably, the Dirac gap (~28 meV) at MnBi2Te4 surface decreases monotonically with increasing temperature and closes right at the Curie temperature, thereby representing the first smoking-gun spectroscopic evidence of magnetization-induced topological surface gap among all known magnetic topological materials. We further demonstrate theoretically that the half-magnetic topological insulator is desirable to realize the half-quantized surface anomalous Hall effect, which serves as a direct proof of the general concept of axion electrodynamics in condensed matter systems.

arXiv comment17 pages, 4 figures

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Cited by in corpus (39)

• Experimental signature of parity anomaly in semi-magnetic topological insulator
• Spectral signatures of the surface anomalous Hall effect in magnetic axion insulators
• Half-Quantized Hall Effect and Power Law Decay of Edge Current Distribution
• 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
• Transport Theory of Half-quantized Hall Conductance in a Semi-magnetic Topological Insulator
• Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$
• Delicate Ferromagnetism in MnBi${}_6$Te${}_{10}$
• Approaching a Minimal Topological Electronic Structure in Antiferromagnetic Topological Insulator MnBi2Te4 via Surface Modification
• Half-Quantized Helical Hinge Currents in Axion Insulators
• Conductivity of two-dimensional narrow gap semiconductors subjected to strong Coulomb disorder
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• 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
• Hinge Spin Polarization in Magnetic Topological Insulators Revealed by Resistance Switch
• Magnetic warping in topological insulators
• Charge Carrier Mediation and Ferromagnetism induced in MnBi6Te10 Magnetic Topological Insulators by antimony doping
• Antiferromagnetic topological insulator with selectively gapped Dirac cones
• Signature of Parity Anomaly: Crossover from One Half to Integer Quantized Hall Conductance in a Finite Magnetic Field
• Two-dimensional ferromagnetic extension of a topological insulator
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• Magnetic topological transistor exploiting layer-selective transport
• Topological Magnetoelectric Response in Ferromagnetic Axion Insulators
• Topological field-effect transistor with quantized ON/OFF conductance of helical/chiral dislocation states
• Conductivity of two-dimensional small gap semiconductors and topological insulators in strong Coulomb disorder
• Intrinsic ferromagnetic and antiferromagnetic axion insulators in van der Waals materials Mn\emph{X}${}_2$\emph{B}${}_2$\emph{T}${}_6$ family
• Evidence for Half-Quantized Chiral Edge Current in a C = 1/2 Parity Anomaly State
• Large-gap quantum anomalous Hall states induced by functionalizing buckled Bi-III monolayer/Al${}_2$O${}_3$
• Ferroelectrically Switchable Half-Quantized Hall Effect
• The One-dimensional Chiral Anomaly and its Disorder Response
• Single-layer magnet phase in intrinsic magnetic topological insulators, $[\mathrm{MnTe}][{\mathrm{Bi}}_2{\mathrm{Te}}_3{]}_{\mathrm{n}}$, far beyond the thermodynamic limit
• Born approximation study of the strong disorder in magnetized surface states of topological insulator
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
• Accurate polymorphous description of the paramagnetic phases in MnBi${}_2$Te${}_4$
• Relationship among Structural, Disordered, Magnetism and Band Topology in MnSb2Te4(Sb2Te3)n Family
• Fate of surface gaps in magnetic topological insulators