Chiral transport along magnetic domain walls in the quantum anomalous Hall effect

Abstract

The recent prediction, and subsequent discovery, of the quantum anomalous Hall (QAH) effect in thin films of the three-dimensional ferromagnetic topological insulator (MTI) (Cr${}_y$Bi${}_x$Sb${}_{1-x-y}$)${}_2$Te${}_3$ has opened new possibilities for chiral-edge-state-based devices in zero external magnetic field. Like the $\nu =1$ quantum Hall system, the QAH system is predicted to have a single chiral edge mode circulating along the boundary of the film. Backscattering of the chiral edge mode should be suppressed, as recently verified by the observation of well-quantized Hall resistivities ${\rho }_{yx}=\pm h/e^2$, along with longitudinal resistivities as low as a few ohms. Dissipationless 1D conduction is also expected along magnetic domain walls. Here, we intentionally create a magnetic domain wall in a MTI and study electrical transport along the domain wall. We present the first observation of chiral transport along domain walls, in agreement with theoretical predictions. We present further evidence that two modes equilibrate and co-propagate along the length of the domain wall.

arXiv comment5 pages, 3 figures, with 8 pages of supplementary information

References in corpus (19)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
• Topological Superconductivity and Superfluidity
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Surface quantized anomalous Hall current and magneto-electric effect in magnetically disordered topological insulators
• Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
• Precise quantization of anomalous Hall effect near zero magnetic field
• Metal-to-Insulator Switching in Quantum Anomalous Hall States
• Visualization of superparamagnetic dynamics in magnetic topological insulators
• Giant Anisotropic Magnetoresistance in a Quantum Anomalous Hall Insulator
• Universal Scaling of Quantum Anomalous Hall Plateau Transition
• Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect
• Selective equilibration of spin and valley polarized quantum Hall edge states in graphene
• Large discrete jumps observed in the transition between Chern states in a ferromagnetic Topological Insulator
• Domain wall of a ferromagnet on a three-dimensional topological insulator
• Domain Wall in a Quantum Anomalous Hall Insulator as a Magnetoelectric Piston

Cited by in corpus (26)

• Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
• Colloquium: Quantum anomalous Hall effect
• Nanoscale imaging of equilibrium quantum Hall edge currents and of the magnetic monopole response in graphene
• Manipulation and Characterization of the Valley Polarized Topological Kink States in Graphene Based Interferometers
• Current-induced breakdown of the quantum anomalous Hall effect
• Progress and prospects in the quantum anomalous Hall effect
• Domain wall induced spin-polarized flat bands in antiferromagnetic topological insulators
• Creation of Chiral Interface Channels for Quantized Transport in Magnetic Topological Insulator Multilayer Heterostructures
• Implementing a synthetic magnetic vector potential in a 2D superconducting qubit array
• Magnetoelectric control of topological phases in graphene
• Severe Dirac Mass Gap Suppression in Sb_2Te_3-based Quantum Anomalous Hall Materials
• Local optical control of ferromagnetism and chemical potential in a topological insulator
• Current Driven Magnetization Reversal in Orbital Chern Insulators
• Volkov-Pankratov states in topological superconductors
• Emergent Energy Dissipation in Quantum Limit
• Configuration-Sensitive Transport on Domain Walls of a Magnetic Topological Insulator
• Spectral features of magnetic domain walls on surface of 3D topological insulators
• Optical control of topological memory based on orbital magnetization
• Magnetoconductance signatures of chiral domain-wall bound states in magnetic topological insulators
• Two-dimensional Dirac fermions in a mass superlattice
• Engineering Topological quantum dot through planar magnetization in bismuthene
• Controllable Majorana fermions on domain walls of a magnetic topological insulator
• The interplay of ferroelectricity and magneto-transport in non-magnetic moiré superlattices
• Chiral edge transport along domain walls in magnetic topological insulator nanoribbons
• Charged magnons on the surface of a topological insulator
• Measured potential profile in a quantum anomalous Hall system suggests bulk-dominated current flow