One-dimensional edge state transport in a topological Kondo insulator

Abstract

Topological insulators, with metallic boundary states protected against time-reversal-invariant perturbations, are a promising avenue for realizing exotic quantum states of matter including various excitations of collective modes predicted in particle physics, such as Majorana fermions and axions. According to theoretical predictions, a topological insulating state can emerge from not only a weakly interacting system with strong spin-orbit coupling, but also in insulators driven by strong electron correlations. The Kondo insulator compound SmB6 is an ideal candidate for realizing this exotic state of matter, with hybridization between itinerant conduction electrons and localized $f$-electrons driving an insulating gap and metallic surface states at low temperatures. Here we exploit the existence of surface ferromagnetism in SmB6 to investigate the topological nature of metallic surface states by studying magnetotransport properties at very low temperatures. We find evidence of one-dimensional surface transport with a quantized conductance value of $e^2/h$ originating from the chiral edge channels of ferromagnetic domain walls, providing strong evidence that topologically non-trivial surface states exist in SmB6.

replaced with revised version

References in corpus (10)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Topological Insulators with Inversion Symmetry
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• Observation of topological surface state quantum Hall effect in an intrinsic three-dimensional topological insulator
• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Tuning bulk and surface conduction in topological Kondo insulator SmB6
• Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
• Low-temperature magnetic fluctuations in the Kondo insulator SmB6

Cited by in corpus (55)

• Topological Kondo Insulators
• Real-space imaging of a topological protected edge state with ultracold atoms in an amplitude-chirped optical lattice
• Möbius Kondo Insulators
• Additional energy scale in SmB${}_6$ at low temperature
• Imaging emergent heavy Dirac fermions of a topological Kondo insulator
• Robustness of the Insulating Bulk in the Topological Kondo Insulator SmB${}_6$
• 4$f$ crystal field ground state of the strongly correlated topological insulator SmB${}_6$
• Bulk and surface electronic properties of SmB6: a hard x-ray photoelectron spectroscopy study
• Consistency between ARPES and STM measurements on SmB${}_6$
• Towards the manipulation of topological states of matter: A perspective from electron transport
• Observation of the superconducting proximity effect in the surface state of SmB6 thin films
• Suppression of magnetic excitations near the surface of the topological Kondo insulator SmB6
• Definitive Surface Magnetotransport Study of SmB${}_6$
• Surface-induced positive planar Hall effect in topological Kondo insulator SmB6 microribbons
• The Effects of Spin-Excitons on the Surface States of SmB6: A Photoemission Study
• Magnetic impurities in Kondo insulators: An application to samarium hexaboride
• Spin textures on general surfaces of the correlated topological insulator SmB6
• Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
• Tunable skyrmion-skyrmion binding on the surface of a topological insulator
• Magnetic skyrmion crystal at a topological insulator surface
• Robust Surface States indicated by Magnetotransport in SmB6 Thin Films
• Electrical detection of surface spin polarization of candidate topological Kondo insulator SmB6
• Anomalous Hall Effect on the surface of topological Kondo insulators
• Topological Kondo semimetal and insulator in AB-stacked heterobilayer transition metal dichalcogenides
• Robust scheme for magnetotransport analysis in topological insulators
• Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields
• Quantum spin fluctuations in the bulk insulating state of pure and Fe-doped SmB6
• A RIXS investigation of the crystal-field splitting of Sm${}^{3+}$ in SmB${}_6$
• Signature of surface state coupling in thin films of the topological Kondo insulator SmB${}_6$ from anisotropic magnetoresistance
• Puzzle maker in SmB6: accompany-type valence fluctuation state
• Ferromagnetism and glassiness on the surface of topological insulators
• Spin-selective tunneling from nanowires of the candidate topological Kondo insulator SmB6
• Magnetoconductance signatures of chiral domain-wall bound states in magnetic topological insulators
• Topology and Magnetism in the Kondo Insulator Phase Diagram
• Non-universal weak antilocalization effect in cubic topological Kondo insulators
• Long-lived non-equilibrium superconductivity in a non-centrosymmetric Rashba semiconductor
• How to identify and characterize strongly correlated topological semimetals
• Probing the interplay between surface and bulk states in the topological Kondo insulator SmB${}_6$ through conductance fluctuation spectroscopy
• Irreversible proliferation of magnetic moments at cleaved surfaces of the topological Kondo insulator SmB6
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Electrical detection of the inverse Edelstein effect on the surface of SmB${}_6$
• Unconventional Josephson junctions with topological Kondo insulator weak links
• Direct observation of surface state thermal oscillation in SmB6 oscillators
• Disordered 2D ferromagnetism at the surface of FeSi
• Charged magnons on the surface of a topological insulator
• Observation of the superconducting proximity effect from surface states in SmB${}_6$/YB${}_6$ thin film heterostructures via terahertz spectroscopy
• Correlation Induced Magnetic Topological Phases in Mixed-Valence Compound SmB6
• Importance of orbital fluctuations for the magnetic dynamics in heavy-fermion compound SmB${}_6$
• Prediction of at topological $p+ip$ excitonic insulator with parity anomaly
• Thermoelectric signals of state transition in polycrystalline SmB6
• Tunable zero-energy Dirac and Luttinger nodes in a two-dimensional topological superconductor
• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering
• Nanoscale Conducting and Insulating Domains on YbB${}_6$
• Phases and phase transitions of an $S=3/2$ chain on metallic and semi-metallic surfaces
• Effect of valence fluctuations on the ground state properties of SmB6