title: Experimental verification of PbBi2Te4 as a 3D topological insulator.
abstract: The experimental evidence is presented of the topological insulator state in PbBi2Te4. A single surface Dirac cone is observed by angle-resolved photoemission spectroscopy with synchrotron radiation. Topological invariants Z2 are calculated from the ab initio band structure to be 1;(111). The observed two-dimensional isoenergy contours in the bulk energy gap are found to be the largest among the known three-dimensional topological insulators. This opens a pathway to achieving a sufficiently large spin current density in future spintronic devices.
authors.affiliation: Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kuroda
authors.forename: H
authors.initials: H
authors.lastname: Miyahara
authors.forename: M
authors.initials: M
authors.lastname: Ye
authors.forename: S V
authors.initials: SV
authors.lastname: Eremeev
authors.forename: Yu M
authors.initials: YM
authors.lastname: Koroteev
authors.forename: E E
authors.initials: EE
authors.lastname: Krasovskii
authors.forename: E V
authors.initials: EV
authors.lastname: Chulkov
authors.forename: S
authors.initials: S
authors.lastname: Hiramoto
authors.forename: C
authors.initials: C
authors.lastname: Moriyoshi
authors.forename: Y
authors.initials: Y
authors.lastname: Kuroiwa
authors.forename: K
authors.initials: K
authors.lastname: Miyamoto
authors.forename: T
authors.initials: T
authors.lastname: Okuda
authors.forename: M
authors.initials: M
authors.lastname: Arita
authors.forename: K
authors.initials: K
authors.lastname: Shimada
authors.forename: H
authors.initials: H
authors.lastname: Namatame
authors.forename: M
authors.initials: M
authors.lastname: Taniguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Ueda
authors.forename: A
authors.initials: A
authors.lastname: Kimura