Kondo Breakdown in Topological Kondo Insulators

Abstract

Motivated by the observation of light surface states in SmB6, we examine the effects of surface Kondo breakdown in topological Kondo insulators. We present both numerical and analytic results which show that the decoupling of the localized moments at the surface disturbs the compensation between light and heavy electrons and dopes the Dirac cone. Dispersion of these uncompensated surface states are dominated by inter-site hopping, which leads to a much lighter quasiparticles. These surface states are also highly durable against the effects of surface magnetism and decreasing thickness of the sample.

Minor changes, published version

References in corpus (9)

• Fractionalized Fermi liquids
• Correlated Topological Insulators with Mixed Valence
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Kondo Breakdown as a Selective Mott Transition in the Anderson Lattice
• Heavy surface state in a possible topological Kondo insulator: Magneto-thermoelectric transport on the (011)-plane of SmB${}_6$
• Composition-spread Growth and the Robust Topological Surface State of Kondo insulator SmB6 Thin Films
• End states in a 1-D topological Kondo insulator
• A Strongly-Interacting Dirac Liquid on the Surface of a Topological Kondo Insulator

Cited by in corpus (13)

• Excitons in topological Kondo insulators - theory of thermodynamic and transport anomalies in SmB${}_6$
• Additional energy scale in SmB${}_6$ at low temperature
• 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
• Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
• Spin- and angle-resolved photoemission on the topological Kondo Insulator candidate: SmB6
• Signature of surface state coupling in thin films of the topological Kondo insulator SmB${}_6$ from anisotropic magnetoresistance
• Ferromagnetism and glassiness on the surface of topological insulators
• Spin-selective tunneling from nanowires of the candidate topological Kondo insulator SmB6
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Mapping out the emergence of topological features in the highly alloyed topological Kondo insulators Sm${}_{1-x}{M}_x$B${}_6$ ($M$=Eu, Ce)
• Persistence of correlation-driven surface states in SmB6 under pressure
• Evolution of topological end states in the one-dimensional Kondo-Heisenberg model with site modulation