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arXiv · 1907.03899

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

Patrik Thunström·Karsten Held
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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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Patrik Thunström, Karsten Held. 2019-07-08. Topology of SmB$_6$ determined by dynamical mean field theory. https://doi.org/10.1103/physrevb.104.075131

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