Document Type

Article

Publication Date

5-26-2011

Journal or Book Title

Physical Review B

Volume

83

First Page

205133

DOI

10.1103/PhysRevB.83.205133

Abstract

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.

Comments

This article is from Physical Review B 83 (2011): 205133, doi:10.1103/PhysRevB.83.205133. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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