title: Surface-State Spin Textures and Mirror Chern Numbers in Topological Kondo Insulators.
abstract: The recent discovery of topological Kondo insulators has triggered renewed interest in the well-known Kondo insulator samarium hexaboride, which is hypothesized to belong to this family. In this Letter, we study the spin texture of the topologically protected surface states in such a topological Kondo insulator. In particular, we derive close relationships between (i) the form of the hybridization matrix at certain high-symmetry points, (ii) the mirror Chern numbers of the system, and (iii) the observable spin texture of the topological surface states. In this way, a robust classification of topological Kondo insulators and their surface-state spin texture is achieved. We underpin our findings with numerical calculations of several simplified and realistic models for systems like samarium hexaboride.
authors.affiliation: Institut für Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland.
authors.forename: Markus
authors.initials: M
authors.lastname: Legner
authors.affiliation: Institut für Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland.
authors.forename: Andreas
authors.initials: A
authors.lastname: Rüegg
authors.affiliation: Institut für Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland.
authors.forename: Manfred
authors.initials: M
authors.lastname: Sigrist