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A synergistic effect between strong electron correlation and spin-orbitinteraction (SOI) has been theoretically predicted to result in a newtopological state of quantum matter on Kondo insulators (KIs), so-calledtopological Kondo insulators (TKIs). One TKI candidate has been experimentallyobserved on the KI SmB6(001), and the origin of the surface states (SS) and thetopological order of SmB6 has been actively discussed. Here, we show a metallicSS on the clean surface of another TKI candidate YbB12(001), usingangle-resolved photoelectron spectroscopy. The SS showed temperature-dependentreconstruction corresponding with the Kondo effect observed for bulk states.Despite the low-temperature insulating bulk, the reconstructed SS with c-fhybridization was metallic, forming a closed Fermi contour surrounding$\bar{\Gamma}$ on the surface Brillouin zone and agreeing with thetheoretically expected behavior for SS on TKIs. These results demonstrate thetemperature-dependent holistic reconstruction of two-dimensional stateslocalized on KIs surface driven by the Kondo effect.

Surface Kondo Effect and Non-Trivial Metallic State of the Kondo Insulator YbB12