Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4

Abstract

The interplay between band topology and magnetic order plays a key role in quantum states of matter. MnBi2Te4, a van der Waals magnet, has recently emerged as an exciting platform for exploring Chern insulator physics. Its layered antiferromagnetic order was predicted to enable even-odd layer-number dependent topological states, supported by promising edge transport measurements. Furthermore, it becomes a Chern insulator when all spins are aligned by an applied magnetic field. However, the evolution of the bulk electronic structure as the magnetic state is continuously tuned and its dependence on layer number remains unexplored. Here, employing multimodal probes, we establish one-to-one correspondence between bulk electronic structure, magnetic state, topological order, and layer thickness in atomically thin MnBi2Te4 devices. As the magnetic state is tuned through the canted magnetic phase, we observe a band crossing, i.e., the closing and reopening of the bulk bandgap, corresponding to the concurrent topological phase transition. Surprisingly, we find that the even- and odd-layer number devices exhibit a similar topological phase transition coupled to magnetic states, distinct from recent theoretical and experimental reports. Our findings shed new light on the interplay between band topology and magnetic order in this newly discovered topological magnet and validate the band crossing with concurrent measurements of topological invariant in a continuously tuned topological phase transition.

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• Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
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• Prediction and observation of the first antiferromagnetic topological insulator
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
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• Experimental realization of an intrinsic magnetic topological insulator
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• Unique thickness-dependent properties of the van der Waals interlayer antiferromagnet $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$ films
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Quantum anomalous Hall effect and related topological electronic states
• High-Chern-Number and High-Temperature Quantum Hall Effect without Landau Levels
• Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
• A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling
• Natural van der Waals heterostructural single crystals with both magnetic and topological properties
• Tuning Chern Number in Quantum Anomalous Hall Insulators
• Evolution of structural, magnetic and transport properties in MnBi2-xSbxTe4
• A-type Antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals
• Coincidence of Superparamagnetism and perfect quantization in the Quantum Anomalous Hall state
• Magnetic imaging of antiferromagnetic domain walls

Cited by in corpus (69)

• Colloquium: Quantum anomalous Hall effect
• Layer Hall effect in a 2D topological Axion antiferromagnet
• Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure
• Unification of Nonlinear Anomalous Hall Effect and Nonreciprocal Magnetoresistance in Metals by the Quantum Geometry
• Site Mixing for Engineering Magnetic Topological Insulators
• Even-Odd Layer-Dependent Anomalous Hall Effect in Topological Magnet MnBi2Te4 Thin Films
• Intrinsic magnetic topological insulators
• Electric control of a canted-antiferromagnetic Chern insulator
• Axion optical induction of antiferromagnetic order
• Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi2Te4 thin films
• Ferromagnetic-antiferromagnetic coexisting ground states and exchange bias effects in $\mathbf{MnB}{\mathbf{i}}_4\mathbf{T}{\mathbf{e}}_7$ and $\mathbf{MnB}{\mathbf{i}}_6\mathbf{T}{\mathbf{e}}_{10}$
• Routes to realize the axion-insulator phase in MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ family: a perspective
• Topological response of the anomalous Hall effect in MnBi2Te4 due to magnetic canting
• Distinct magnetic gaps between antiferromagnetic and ferromagnetic orders driven by surface defects in the topological magnet MnBi2Te4
• Antiferromagnetic Quantum Anomalous Hall Effect Modulated by Spin Flips and Flops
• Observation of the Axion quasiparticle in 2D MnBi${}_2$Te${}_4$
• Progress and prospects in the quantum anomalous Hall effect
• Visualizing the interplay of Dirac mass gap and magnetism at nanoscale in intrinsic magnetic topological insulators
• Large Exchange Bias Effect and Coverage-Dependent Interfacial Coupling in CrI3/MnBi2Te4 van der Waals Heterostructures
• Experimental evidence on the dissipationless transport of chiral edge state of the high-field Chern insulator in MnBi2Te4 nanodevices
• Quantum Imaging of Magnetic Phase Transitions and Spin Fluctuations in Intrinsic Magnetic Topological Nanoflakes
• Ultrafast coherent interlayer phonon dynamics in atomically thin layers of MnBi2Te4
• Local manifestations of thickness dependent topology and axion edge state in topological magnet MnBi${}_2$Te${}_4$
• Towards the Quantized Anomalous Hall effect in AlO${}_x$-capped MnBi${}_2$Te${}_4$
• The elusive quantum anomalous Hall effect in MnBi2Te4: a materials perspective
• Chern Number Tunable Quantum Anomalous Hall Effect in Compensated Antiferromagnets
• Metamagnetism of few layer topological antiferromagnets
• Gate-Tunable Quantum Anomalous Hall Effects in MnBi${}_2$Te${}_4$ Thin Films
• Ferromagnetic MnBi4Te7 obtained with low concentration Sb doping: A promising platform for exploring topological quantum states
• Quantum Oscillations in the Field-induced Ferromagnetic State of MnBi${}_{2-x}$Sb${}_x$Te${}_4$
• Real-time observation of magnetization and magnon dynamics in a two-dimensional topological antiferromagnet MnBi2Te4
• Electrically Controlled Anomalous Hall Effect and Orbital Magnetization in Topological Magnet MnBi2Te4
• Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4
• Fabrication-induced even-odd discrepancy of magnetotransport in few-layer MnBi${}_2$Te${}_4$
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Anomalous Second Harmonic Generation from Atomically Thin MnBi2Te4
• Observation of magnetism induced topological edge state in antiferromagnetic topological insulator MnBi4Te7
• Even-Odd Layer-Dependent Exchange Bias Effect in MnBi2Te4 Chern Insulator Devices
• Dynamical properties of magnetic topological insulator $T$Bi${}_2$Te${}_4$ ($T=$Mn, Fe): phonons dispersion, Raman active modes, and chiral phonons study
• Coexistence of Superconductivity and Antiferromagnetism in Topological Magnet MnBi2Te4 Films
• Role of Magnetic Defects and Defect-engineering of Magnetic Topological Insulators
• Direct visualization of surface spin-flip transition in MnBi4Te7
• Charge Carrier Mediation and Ferromagnetism induced in MnBi6Te10 Magnetic Topological Insulators by antimony doping
• Engineering robust strain transmission in van der Waals heterostructure devices
• Proximity-induced superconducting gap in the intrinsic magnetic topological insulator MnBi2Te4
• Magnetic topological transistor exploiting layer-selective transport
• Lossless Spin-Orbit Torque in Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Novel magnetic topological insulator FeBi${}_2$Te${}_4$ with controllable topological quantum phase
• Superconductivity by alloying the topological insulator SnBi2Te4
• Correlation between magnetic domain structures and quantum anomalous Hall effect in epitaxial MnBi2Te4 thin films
• Magnetotransport induced by anomalous Hall effect
• Helical Luttinger liquid on the edge of a 2-dimensional topological antiferromagnet
• Direct observation of chiral edge current at zero magnetic field in odd-layer MnBi${}_2$Te${}_4$
• Room-temperature nonlinear transport and microwave rectification in antiferromagnetic MnBi${}_2$Te${}_4$ films
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• Hall-effect in the MnBi_2Te_4 crystal using silicon nitride nanomembrane via contacts
• Néel Spin-Orbit Torque in Antiferromagnetic Quantum Spin and Anomalous Hall Insulators
• Topological magnon-polaron transport in a bilayer van der Waals magnet
• Tailoring Neel orders in Layered Topological Antiferromagnets
• Gate-tunable magnetoresistance in six-septuple-layer MnBi${}_2$Te${}_4$
• Single-layer magnet phase in intrinsic magnetic topological insulators, $[\mathrm{MnTe}][{\mathrm{Bi}}_2{\mathrm{Te}}_3{]}_{\mathrm{n}}$, far beyond the thermodynamic limit
• Quantum Transport and Magnetism of Dirac Electrons in Solids
• Surface Reconstructions in Thin-Films of Magnetic Topological Insulator MnBi${}_2$Te${}_4$
• Direct visualization of edge state in even-layer MnBi2Te4 at zero magnetic field
• Strongly enhanced topological quantum phases in dual-surface AlO${}_x$-encapsulated MnBi${}_2$Te${}_4$
• Vapor transport growth of MnBi2Te4 and related compounds
• Tunable linear and nonlinear anomalous Hall transport in two-dimensional CrPS${}_4$
• Defect-induced displacement of topological surface state in quantum magnet MnBi${}_2$Te${}_4$
• Light-driven topological and magnetic phase transitions in thin-layer antiferromagnets