Topology of SmB${}_6$ determined by dynamical mean field theory

Abstract

Whether SmB6 is a topological insulator remains hotly debated. Our density functional theory plus dynamical mean field theory calculations are in excellent agreement with a large range of experiments, from the 4f5.5 intermediate valency to x-ray and photoemission spectra. Using the pole extended (PE) Hamiltonian, which fully captures the self-energy, we show that SmB6 is a strongly correlated topological insulator, albeit not a Kondo insulator. The PE Hamiltonian is proved to be topological (in)equivalent to the topological Hamiltonian for (non-)local self-energies. The topological surface states are analyzed, addressing conflicting interpretations of photoemission data.

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• Resistivity saturation in Kondo insulators
• Local vs non-local correlation effects in interacting quantum spin Hall insulators
• Surface exceptional points in a topological Kondo insulator
• Inexorable Edge Kondo Breakdown in Topological Kondo Insulators
• Topology of SmB6 revisited by means of topological quantum chemistry
• Mapping out the emergence of topological features in the highly alloyed topological Kondo insulators Sm${}_{1-x}{M}_x$B${}_6$ ($M$=Eu, Ce)
• Band structure picture for topology in strongly correlated systems with the ghost Gutzwiller ansatz