Universal properties of the near-gap spectra of SmB6: dynamical mean-field calculations and photoemission experiments

Abstract

Samarium hexaboride (SmB6) has been presumed to show a topological Kondo insulating state consisting of fully occupied quasiparticle bands in the concept of a Fermi liquid. This gap emerging below a small coherence temperature is the ultimate sign of coherence for a many-body system, which in addition induces a non-trivial topology. Here, we demonstrate that just one energy scale governs the gap formation in SmB6, which supports the Fermi liquid description. The temperature dependence of the gap formation in the mixed valence regime is captured within the dynamical mean field (DMFT) approximation to the periodic Anderson model (PAM). The scaling property of the model with the topological coherence temperature provides a strong connection to the photoemission spectra of SmB6. Our results suggest a simple way to compare a model study and an experiment result for heavy fermion insulators.

References in corpus (24)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Correlated Topological Insulators with Mixed Valence
• Unconventional Fermi surface in an insulating state
• Correlation effects in two-dimensional topological insulators
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Kondo Breakdown in Topological Kondo Insulators
• Kondo Breakdown and Quantum Oscillations in SmB${}_6$
• Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6
• Surface Theory of a Family of Topological Kondo Insulators
• Exotic Kondo crossover in a wide temperature region in the topological Kondo insulator SmB6 revealed by high-resolution ARPES
• Termination-dependent Surface In-gap States in a Mixed-valent Topological Insulator: SmB${}_6$
• Topological surface states interacting with bulk excitations in the Kondo insulator SmB${}_6$ revealed via planar tunneling spectroscopy
• Coexistence of light and heavy surface states in a topological multi-band Kondo insulator
• Surface-state spin textures and mirror Chern numbers in topological Kondo insulators
• Bulk Fermi surface of charge-neutral excitations in SmB6 or not: a heat-transport study
• End states in a 1-D topological Kondo insulator
• Topological properties and the dynamical crossover from mixed-valence to Kondo-lattice behavior in golden phase of SmS
• Low-temperature magnetic fluctuations in the Kondo insulator SmB6
• Distinct topological crystalline phases in models for the strongly correlated topological insulator SmB6
• Incomplete Protection of the Surface Weyl Cones of the Kondo Insulator SmB${}_6$: Spin Exciton Scattering
• Two-dimensional heavy fermions on the strongly correlated boundaries of Kondo topological insulators
• Model Hamiltonian for topological Kondo insulator SmB6
• Kondo holes in topological Kondo insulators: Spectral properties and surface quasiparticle interference
• Optical conductivity of topological Kondo insulating states

Cited by in corpus (5)

• Thermoelectricity in correlated narrow-gap semiconductors
• Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu${}_2$
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Comparative Scanning Tunneling Microscopy Study on Hexaborides
• Anomalous 4$f$ fine structure in TmSe${}_{1-x}$Te${}_x$ across the metal-insulator transition