Journal or Book Title
Physical Review B
Rare-earth platinum bismuth (RPtBi) has been proposed recently as a potential topological insulator. In this paper, we present measurements of the metallic surface electronic structure in three members of this family, using angle-resolved photoemission spectroscopy (ARPES). Our data show clear spin-orbit splitting of the surface bands and the Kramers’ degeneracy of spins at the Γ̄ and M̄ points, which is reproduced nicely with our full-potential linearized augmented plane wave calculation for a surface electronic state. Topologically nontrivial behavior is signified by band inversion in the calculated bulk electronic structures, yet no direct indication of such behavior is detected by ARPES except for a weak Fermi crossing detected in close proximity to the Γ̄ point, making the total number of Fermi crossings odd. In the surface band calculation, however, this crossing is explained by a Kramers pair of bands that are very close to each other. The classification of this family of materials as topological insulators remains an open question.
American Physical Society
Liui, Cheng; Lee, Yongbin; Kondo, Takeshi; Mun, Eundeok; Caudi, Malinda; Harmon, Bruce N.; Bud'ko, Sergey L.; Canfield, Paul C.; and Kaminski, Adam, "Metallic surface electronic state in half-Heusler compounds RPtBi (R= Lu, Dy, Gd)" (2011). Ames Laboratory Publications. 188.