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Rare-earth platinum bismuth (RPtBi) has been recently proposed to be apotential topological insulator. In this paper we present measurements of themetallic surface electronic structure in three members of this family, usingangle resolved photoemission spectroscopy (ARPES). Our data shows clearspin-orbit splitting of the surface bands and the Kramers' degeneracy of spinsat the Gamma and M points, which is nicely reproduced with our full-potentialaugmented plane wave calculation for a surface electronic state. No directindication of topologically non-trivial behavior is detected, except for a weakFermi crossing detected in close vicinity to the Gamma point, making the totalnumber of Fermi crossings odd. In the surface band calculation, however, thiscrossing is explained by another Kramers' pair where the two splitting bandsare very close to each other. The classification of this family of materials astopological insulators remains an open question.

Metallic surface electronic state in half-Heusler compounds RPtBi (R = Lu, Dy, Gd)