Magnetic and defect probes of the SmB${}_6$ surface state

Abstract

The impact of non-magnetic and magnetic impurities on topological insulators is a central problem concerning their fundamental physics and possible novel spintronics and quantum computing applications. SmB${}_6$, predicted to be a topological Kondo insulator, is considered a benchmark material. Using a spin-polarized tip in scanning tunneling spectroscopy destroys the signature peak of the topological surface state, revealing its spin texture. Further, combining local STS with macroscopic transport measurements on SmB${}_6$ containing different substitutions enables us to investigate the effect of impurities. The surface states around impurities are locally suppressed with different length scales depending on their magnetic properties and, for sufficiently high impurity level, globally destroyed. Our study points directly to the topological nature of SmB${}_6$, and unveils, microscopically and macroscopically, how impurities -- magnetic or non-magnetic -- affect topological surface states.

References in corpus (31)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Topological Kondo Insulators
• Magnetic impurities on the surface of a topological insulator
• Low-temperature surface conduction in the Kondo insulator SmB${}_6$
• Correlated Topological Insulators with Mixed Valence
• Topological surface state in the Kondo Insulator Samarium Hexaboride
• Robust Surface Hall Effect and Nonlocal Transport in SmB6: Indication for an Ideal Topological Insulator
• Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
• Impurity-induced states on the surface of 3D topological insulators
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Photoemission Spectroscopy of Magnetic and Non-magnetic Impurities on the Surface of the Bi${}_2$Se${}_3$ Topological Insulator
• Cubic Topological Kondo Insulators
• Polarity-driven surface metallicity in SmB${}_6$
• Hybridization gap and Fano resonance in SmB${}_6$
• Emergence of a coherent in-gap state in SmB6 Kondo insulator revealed by scanning tunneling spectroscopy
• Momentum-Dependent Hybridization Gap and dispersive in-gap state of The Kondo Semiconductor SmB6
• Samarium hexaboride: A trivial surface conductor
• The fate of topological-insulator surface states under strong disorder
• Dual nature of magnetic dopants and competing trends in topological insulators
• Additional energy scale in SmB${}_6$ at low temperature
• Quantum impurity on the surface of a topological insulator
• The energy gap of intermediate-valent SmB6 studied by point-contact spectroscopy
• Heavy surface state in a possible topological Kondo insulator: Magneto-thermoelectric transport on the (011)-plane of SmB${}_6$
• Spin Injection and Inverse Edelstein Effect in the Surface States of Topological Kondo Insulator SmB6
• Electronic structure near an impurity and terrace on the surface of a 3-dimensional topological insulator
• Spin-polarized angle-resolved photoelectron spectroscopy of the so-predicted Kondo topological insulator SmB6
• Defects in Heavy-Fermion Materials: Unveiling Strong Correlations in Real Space
• Mass acquisition of Dirac fermions in Cr-doped topological insulator Sb2Te3 films
• Surface and electronic structure of SmB${}_6$ through Scanning Tunneling Microscopy
• Observation of a well-defined hybridization gap and in-gap states on the SmB6 (001) surface
• Spin textures on general surfaces of the correlated topological insulator SmB6

Cited by in corpus (21)

• Localized spin-orbit polaron in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Many-body Resonance in a Correlated Topological Kagome Antiferromagnet
• Quantum oscillations in flux-grown SmB6 with embedded aluminum
• Robustness of the Insulating Bulk in the Topological Kondo Insulator SmB${}_6$
• Consistency between ARPES and STM measurements on SmB${}_6$
• Visualizing the atomic-scale origin of metallic behavior in Kondo insulators
• Definitive Surface Magnetotransport Study of SmB${}_6$
• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Tuning the topological character of half-Heusler systems: A comparative study on Y$T$Bi ($T$ = Pd, Pt)
• Surface resonance of the (2$\times$1) reconstructed lanthanum hexaboride (001)-cleavage plane: a combined STM and DFT study
• Extraordinary Bulk Insulating Behavior in the Strongly Correlated Materials FeSi and FeSb${}_2$
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Comparative Scanning Tunneling Microscopy Study on Hexaborides
• Realizing a topological diode effect on the surface of a topological Kondo insulator
• Phase stability in SmB${}_6$
• Surface excitations relaxation in the Kondo insulator Sm${}_{1-x}$Gd${}_x$B${}_6$
• Revisiting the Possible 4f7 5d1 Ground State of Gd Impurities in SmB6 by Electron Spin Resonance
• Observation of the superconducting proximity effect from surface states in SmB${}_6$/YB${}_6$ thin film heterostructures via terahertz spectroscopy
• Many-body electronic structure in pyrochlore superconductor CsBi2 and spin liquid Pr2Ir2O7
• Persistence of correlation-driven surface states in SmB6 under pressure
• Fragility of Topology under Electronic Correlations in Iron Chalcogenides