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Phys Rev Lett. 2013 Nov 27;111(22):226403. Epub 2013 Nov 27.

Cubic topological Kondo insulators.

Author information

1
Department of Physics and Astronomy, Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854-8019, USA.
2
Department of Physics, Kent State University, Kent, Ohio 44242, USA.
3
Department of Physics and Astronomy, Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854-8019, USA and Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom.

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 Γ(8) 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 three Dirac cones with heavy quasiparticles.

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