Quantum interference in macroscopic crystals of non-metallic Bi${}_2$Se${}_3$

Abstract

Photoemission experiments have shown that Bi${}_2$Se${}_3$ is a topological insulator. By controlled doping, we have obtained crystals of Bi${}_2$Se${}_3$ with non-metallic conduction. At low temperatures, we uncover a novel type of magnetofingerprint signal which involves the spin degrees of freedom. Given the mm-sized crystals, the observed amplitude is 200-500$\times$ larger than expected from universal conductance fluctuations. The results point to very long phase breaking lengths in an unusual conductance channel in these non-metallic samples. We discuss the nature of the in-gap conducting states and their relation to the topological surface states.

4 pages, 4 figures, changes in text in final paragraph

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