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SmB6, a well-known Kondo insulator, has been proposed to be an idealtopological insulator with states of topological character located in a clean,bulk electronic gap, namely the Kondo hybridisation gap. Seeing as the Kondogap arises from many body electronic correlations, this would place SmB6 at thehead of a new material class: topological Kondo insulators. Here, for the firsttime, we show that the k-space characteristics of the Kondo hybridisationprocess is the key to unravelling the origin of the two types of metallicstates observed directly by ARPES in the electronic band structure ofSmB6(001). One group of these states is essentially of bulk origin, and cutsthe Fermi level due to the position of the chemical potential 20 meV above thelowest lying 5d-4f hybridisation zone. The other metallic state is moreenigmatic, being weak in intensity, but represents a good candidate for atopological surface state. However, before this claim can be substantiated byan unequivocal measurement of its massless dispersion relation, our data raisesthe bar in terms of the ARPES resolution required, as we show there to be astrong renormalisation of the hybridisation gaps by a factor 2-3 compared totheory, following from the knowledge of the true position of the chemicalpotential and a careful comparison with the predictions from recentLDA+Gutzwiler calculations. All in all, these key pieces of evidence act astriangulation markers, providing a detailed description of the electroniclandscape in SmB6, pointing the way for future, ultrahigh resolution ARPESexperiments to achieve a direct measurement of the Dirac cones in the firsttopological Kondo insulator.

Kondo hybridisation and the origin of metallic states at the (001) surface of SmB6