Coincidence of Superparamagnetism and perfect quantization in the Quantum Anomalous Hall state

Abstract

Topological insulators doped with transition metals have recently been found to host a strong ferromagnetic state with perpendicular to plane anisotropy as well as support a quantum Hall state with edge channel transport, even in the absence of an external magnetic field. It remains unclear however why a robust magnetic state should emerge in materials of relatively low crystalline quality and dilute magnetic doping. Indeed, recent experiments suggest that the ferromagnetism exhibits at least some superparamagnetic character. We report on transport measurements in a sample that shows perfect quantum anomalous Hall quantization, while at the same time exhibits traits in its transport data which suggest inhomogeneities. We speculate that this may be evidence that the percolation path interpretation used to explain the transport during the magnetic reversal may actually have relevance over the entire field range.

5 pages, 4 figure

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Cited by in corpus (61)

• Experimental realization of an intrinsic magnetic topological insulator
• Colloquium: Quantum anomalous Hall effect
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• Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4
• Large-gap magnetic topological heterostructure formed by subsurface incorporation of a ferromagnetic layer
• Non-Majorana Origin of the Half-Quantized Conductance Plateau in Quantum Anomalous Hall Insulator and Superconductor Hybrid Structures
• Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K
• Electronic states and magnetic response of MnBi2Te4 by scanning tunneling microscopy and spectroscopy
• Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect
• Scaling of the Quantum Anomalous Hall Effect as an Indicator of Axion Electrodynamics
• Direct evidence of ferromagnetism in a quantum anomalous Hall system
• Large discrete jumps observed in the transition between Chern states in a ferromagnetic Topological Insulator
• Zero-field quantum anomalous Hall metrology as a step towards a universal quantum standard unit system
• Current-driven instability of quantum anomalous Hall effect in ferromagnetic topological insulators
• Any Axion Insulator Must be a Bulk Three-Dimensional Topological Insulator
• Routes to realize the axion-insulator phase in MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ family: a perspective
• Interface-Induced Sign Reversal of the Anomalous Hall Effect in Magnetic Topological Insulator Heterostructures
• Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators
• Quantum anomalous Hall edge channels survive up to the Curie temperature
• Confinement-Induced Chiral Edge Channel Interaction in Quantum Anomalous Hall Insulators
• Impurity states in the magnetic topological insulator V:(Bi,Sb)${}_2$Te${}_3$
• Coexistence of surface and bulk ferromagnetism mimics skyrmion Hall effect in a topological insulator
• Direct evidence of ferromagnetism in MnSb2Te4
• Progress and prospects in the quantum anomalous Hall effect
• Epitaxy and Structural Properties of (V,Bi,Sb)${}_2$Te${}_3$ Layers Exhibiting the Quantum Anomalous Hall Effect
• Creation of Chiral Interface Channels for Quantized Transport in Magnetic Topological Insulator Multilayer Heterostructures
• Zero Magnetic Field Plateau Phase Transition in Higher Chern Number Quantum Anomalous Hall Insulators
• Observation of superparamagnetism in coexistence with quantum anomalous Hall C=$\pm$1 and C=0 Chern states
• Do topology and ferromagnetism cooperate at the EuS/Bi${}_2$Se${}_3$ interface?
• Bulk dissipation in the quantum anomalous Hall effect
• Impurity scattering on the surface of topological insulator thin films
• Quantum Hall Edge States in Topological Insulator Nanoribbons
• Incipient antiferromagnetism in the Eu-doped topological insulator Bi${}_2$Te${}_3$
• Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)${}_2$Se${}_3$ heterostructures
• Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4
• Domain Wall in a Quantum Anomalous Hall Insulator as a Magnetoelectric Piston
• Quantum Anomalous Parity Hall Effect in Magnetically Disordered Topological Insulator Films
• Ubiquitous impact of localised impurity states on the exchange coupling mechanism in magnetic topological insulators
• Balanced Quantum Hall Resistor
• Smearing of the quantum anomalous Hall effect due to statistical fluctuations of magnetic dopants
• Experimental demonstration of a magnetically induced warping transition in a topological insulator mediated by rare-earth surface dopants
• Macroscopic Quantum Tunneling of a Topological Ferromagnet
• Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)${}_2$Te${}_3$
• Direct probe of ferromagnetic proximity effect at the interface in Fe/SnTe heterostructure by polarized neutron reflectometry
• Three-Dimensional Quantum Anomalous Hall Effect in Magnetic Topological Insulator Trilayers of Hundred-Nanometer Thickness
• Finite field transport response of a dilute magnetic topological insulator based Josephson junction
• Topological Insulators-Based Magnetic Heterostructure
• Effect of chiral selective tunneling on quantum transport in magnetic topological-insulator thin films
• Enhancement of temperature of quantum anomalous Hall effect in two-dimensional germanene/magnetic semiconductor heterostructures
• Edge supercurrent in Josephson junctions based on topological materials
• Gate-tunable magnetoresistance in six-septuple-layer MnBi${}_2$Te${}_4$
• Phonon and defect mediated quantum anomalous Hall insulator to metal transition in magnetically doped topological insulators
• Electromagnon on the Surface of Magnetic Topological Insulator
• Observation of topological Faraday and Kerr rotations in quantum anomalous Hall state by terahertz magneto-optics
• Environmental Doping-Induced Degradation of the Quantum Anomalous Hall Insulators
• Anomalous Fraunhofer-like patterns in quantum anomalous Hall Josephson junction
• Effects of GaAs buffer layer on quantum anomalous Hall insulator Vy(BixSb1-x)2-yTe3
• Electric field manipulation of magnetization in an insulating dilute ferromagnet through piezoelectromagnetic coupling
• Magnetic interactions of 4$f$ electrons in the topological insulator chalcogenide Bi${}_2$Se${}_3$
• Effect of extended confinement on the structure of edge channels in the quantum anomalous Hall effect