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Filipov","submitted_at":"2015-02-05T13:35:27Z","abstract_excerpt":"Recent theoretical and experimental studies suggest that SmB$_6$ is the first topological Kondo insulator: A material in which the interaction between localized and itinerant electrons renders the bulk insulating at low temperature, while topological surface states leave the surface metallic. While this would elegantly explain the material's puzzling conductivity, we find the experimentally observed candidates for both predicted topological surface states to be of trivial character instead: The surface state at $\\bar{\\Gamma}$ is very heavy and shallow with a mere $\\sim 2$ meV binding energy. 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