Low-temperature surface conduction in the Kondo insulator SmB${}_6$

Abstract

We study the transport properties of the Kondo insulator SmB${}_6$ with a specialized configuration designed to distinguish bulk-dominated conduction from surface-dominated conduction. We find that as the material is cooled below 4 K, it exhibits a crossover from bulk to surface conduction with a fully insulating bulk. We take the robustness and magnitude of the surface conductivity, as is manifest in the literature of SmB${}_6$, to be strong evidence for the topological insulator metallic surface states recently predicted for this material.

23 pages, 8 figures. We updated minor editorial changes and references to match the published version

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