Cubic Topological Kondo Insulators

Victor Alexandrov; Maxim Dzero; Piers Coleman

doi:10.1103/PhysRevLett.111.226403

paper

Cubic Topological Kondo Insulators

arXiv:1303.7224 · doi:10.1103/PhysRevLett.111.226403

Abstract

Current theories of Kondo insulators employ the interaction of conduction electrons with localized Kramers doublets originating from a tetragonal crystalline environment, yet all Kondo insulators are cubic. Here we develop a theory of cubic topological Kondo insulators involving the interaction of spin quartets with a conduction sea. The spin quartets greatly increase the potential for strong topological insulators, entirely eliminating the weak-topological phases from the diagram. We show that the relevant topological behavior in cubic Kondo insulators can only reside at the lower symmetry X or M points in the Brillouin zone, leading to a three Dirac cones with heavy quasiparticles.

4 pages, 4 figures and supplementary materials. Clarifying remarks added

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