Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.226403
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Funding
- Ohio Board of Regents Research Incentive Program [OBR-RIP-220573]
- DOE [DE-FG02-99ER45790]
- U.S. National Science Foundation I2CAM International Materials Institute Award [DMR-0844115]
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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 Gamma(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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