Coexistence of light and heavy surface states in a topological multi-band Kondo insulator

Abstract

We analyze the impact of strong correlations on the surface states of a three-dimensional topological Kondo insulator. An important observation is that correlations are strongly increased at the surface, which leads to an energetical confinement of the surface $f$-electrons into a narrow window around the Fermi energy at low enough temperature. This correlation effect in combination with the nontrivial topology has two remarkable consequences: (i) coexistence of light and heavy surface states at low temperatures. While heavy surface states are formed directly in the surface layer, light surface states are formed in the next-nearest surface layer. Furthermore, (ii) with increasing the temperature, the heavy surface states become incoherent and only light surface states can be observed. The coexistence of light and heavy surface states is thereby a remarkable characteristic of the combination of strong correlations and nontrivial topology. We believe that these results are applicable to the candidate topological Kondo insulator SmB6.

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Cited by in corpus (30)

• Additional energy scale in SmB${}_6$ at low temperature
• Breakdown of topological Thouless pumping in the strongly interacting regime
• Exceptional band touching for strongly correlated systems in equilibrium
• Quantum oscillations in strongly correlated topological Kondo insulators
• Non-trivial surface states of samarium hexaboride at the (111) surface
• Evolution of Floquet Topological Quantum States in Driven Semiconductors
• Parity-violating hybridization in heavy Weyl semimetals
• Magnetic states in a three-dimensional topological Kondo insulator
• Behavior of Floquet Topological Quantum States in Optically Driven Semiconductors
• Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
• Quantum metric on the Brillouin Zone in correlated electron systems and its relation to topology for Chern insulators
• Effects of strong correlations on the nonlinear response in Weyl-Kondo semimetals
• Topology of SmB${}_6$ determined by dynamical mean field theory
• Understanding low-temperature bulk transport in samarium hexaboride without relying on in-gap bulk states
• Impact of the Rashba Spin Orbit Coupling on $f$-electron Materials
• Charge neutral fermions and magnetic field driven instability in insulating YbIr${}_3$Si${}_7$
• Surface exceptional points in a topological Kondo insulator
• Universal properties of the near-gap spectra of SmB6: dynamical mean-field calculations and photoemission experiments
• Node-line Dirac semimetal manipulated by Kondo mechanism in nonsymmorphic CePt${}_2$Si${}_2$
• ${\mathcal{Z}}_2$ classification for a novel antiferromagnetic topological insulating phase in three-dimensional topological Kondo insulator
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB${}_6$(001)
• Low-energy excitations and transport functions of the one-dimensional Kondo insulator
• Realizing a topological diode effect on the surface of a topological Kondo insulator
• Hinge non-Hermitian skin effect in the single-particle properties of a strongly correlated f-electron system
• Magnetic effects on Chern Kondo insulator
• Transport in Single Quantum Dots: A Review from Linear Response to Nonlinear Regimes
• Mott transition and magnetism in a fragile topological insulator
• Spectral properties of strongly correlated multi impurity models in the Kondo insulator regime: Emergent coherence, metallic surface states and quantum phase transitions
• Reflection-Symmetry Protected Antiferromagnetic Topological Insulator in Three-Dimensional Heavy-Fermion Systems