title: Experimental realization of a three-dimensional topological insulator, Bi2Te3.
abstract: Three-dimensional topological insulators are a new state of quantum matter with a bulk gap and odd number of relativistic Dirac fermions on the surface. By investigating the surface state of Bi2Te3 with angle-resolved photoemission spectroscopy, we demonstrate that the surface state consists of a single nondegenerate Dirac cone. Furthermore, with appropriate hole doping, the Fermi level can be tuned to intersect only the surface states, indicating a full energy gap for the bulk states. Our results establish that Bi2Te3 is a simple model system for the three-dimensional topological insulator with a single Dirac cone on the surface. The large bulk gap of Bi2Te3 also points to promising potential for high-temperature spintronics applications.
authors.affiliation: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
authors.forename: Y L
authors.initials: YL
authors.lastname: Chen
authors.forename: J G
authors.initials: JG
authors.lastname: Analytis
authors.forename: J-H
authors.initials: JH
authors.lastname: Chu
authors.forename: Z K
authors.initials: ZK
authors.lastname: Liu
authors.forename: S-K
authors.initials: SK
authors.lastname: Mo
authors.forename: X L
authors.initials: XL
authors.lastname: Qi
authors.forename: H J
authors.initials: HJ
authors.lastname: Zhang
authors.forename: D H
authors.initials: DH
authors.lastname: Lu
authors.forename: X
authors.initials: X
authors.lastname: Dai
authors.forename: Z
authors.initials: Z
authors.lastname: Fang
authors.forename: S C
authors.initials: SC
authors.lastname: Zhang
authors.forename: I R
authors.initials: IR
authors.lastname: Fisher
authors.forename: Z
authors.initials: Z
authors.lastname: Hussain
authors.forename: Z-X
authors.initials: ZX
authors.lastname: Shen