Zero-field Edge Magnetoplasmons in a Magnetic Topological Insulator

Abstract

Incorporating ferromagnetic dopants, such as chromium or vanadium, into thin films of the three-dimensional (3D) topological insulator (TI) (Bi,Sb)2Te3 has recently led to the realisation of the quantum anomalous Hall effect (QAHE), a unique phase of quantum matter. These materials are of great interest, since they may support electrical currents that flow without resistance via edge channels, even at zero magnetic field. To date, the QAHE has been investigated using low-frequency transport measurements. However, transport requires contacting the sample and results can be difficult to interpret due to the presence of parallel conductive paths, via either the bulk or surface, or because additional non-chiral edge channels may exist. Here, we move beyond transport measurements by probing the microwave response of a magnetised disk of Cr-(Bi,Sb)2Te3. We identify features associated with chiral edge magnetoplasmons (EMPs), a signature that robust edge-channels are indeed intrinsic to this material system. Our results provide a measure of the velocity of edge excitations without contacting the sample, and pave the way for a new, on-chip circuit element of practical importance: the TI, zero-field microwave circulator.

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• Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
• Fractional quantum anomalous Hall states in twisted bilayer MoTe${}_2$ and WSe${}_2$
• Quantum Nanophotonics in Two-Dimensional Materials
• Microwaves in Quantum Computing
• Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K
• Probing quantum devices with radio-frequency reflectometry
• Breaking time-reversal symmetry with a superconducting flux capacitor
• Hardware-Encoding Grid States in a Non-Reciprocal Superconducting Circuit
• Tunable band topology and optical conductivity in altermagnets
• High-Temperature Quantum Valley Hall Effect with Quantized Resistance and a Topological Switch
• Hall and dissipative viscosity effects on edge magnetoplasmons
• Mesoscopic Transport of Quantum Anomalous Hall Effect in Sub-Micron Size Regime
• Quantum plasmonic non-reciprocity in parity-violating magnets
• Microwave calibration of qubit drive line components at millikelvin temperatures
• Transmission lines and resonators based on quantum Hall plasmonics: electromagnetic field, attenuation and coupling to qubits
• Plasmonic modes at inclined edges of anisotropic 2D materials
• Theory of the microwave impedance microscopy of Chern insulators
• On-chip coherent frequency-domain THz spectroscopy for electrical transport
• Low-damage electron beam lithography for nanostructures on Bi${}_2$Te${}_3$-class topological insulator thin films
• Transmission Lines and Meta-Materials based on Quantum Hall Plasmonics
• Propagation, dissipation and breakdown in quantum anomalous Hall edge states probed by microwave edge plasmons
• Characterization of helical Luttinger liquids in microwave stepped-impedance edge resonators
• Circulation by microwave-induced vortex transport for signal isolation
• Thresholdless excitation of edge plasmons by transverse current
• Drift velocity of edge magnetoplasmons due to magnetic edge channels
• Chiral edge plasmons in quantum anomalous Hall insulators
• Hybridization of edge modes with substrate phonons