Possible observation of topological surface states in a d-electron Kondo Insulator with angle-resolved photoemission spectroscopy*

We use angle-resolved photoemission to probe the low energy bands of a d-electron Kondo Insulator exhibiting many similar properties as the prototypical f-electron topological kondo insulator candidate SmB6. We find a set of fermi surface features that disperse across Ef, despite the bulk being insulating. Photon energy dependence shows the 2D nature of these bands. We discuss similarity and differences to SmB6 and open questions that challenges the current understanding of strongly correlated topological insulators.