title: Quantum interference in macroscopic crystals of nonmetallic Bi2Se3.
abstract: Photoemission experiments have shown that Bi2Se3 is a topological insulator. By controlled doping, we have obtained crystals of Bi2Se3 with nonmetallic 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 200-500x larger than expected from universal conductance fluctuations. The results point to very long phase-breaking lengths in an unusual conductance channel in these nonmetallic samples. We discuss the nature of the in-gap conducting states and their relation to the topological surface states.
authors.affiliation: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: J G
authors.initials: JG
authors.lastname: Checkelsky
authors.forename: Y S
authors.initials: YS
authors.lastname: Hor
authors.forename: M-H
authors.initials: MH
authors.lastname: Liu
authors.forename: D-X
authors.initials: DX
authors.lastname: Qu
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava
authors.forename: N P
authors.initials: NP
authors.lastname: Ong