title: Angle-resolved photoemission spectroscopy of the insulating NaxWO3: Anderson localization, polaron formation, and remnant Fermi surface.
abstract: The electronic structure of the insulating sodium tungsten bronze, Na(0.025)WO(3), is investigated by high-resolution angle-resolved photoemission spectroscopy. We find that near-E(F) states are localized due to the strong disorder arising from random distribution of Na+ ions in the WO(3) lattice, which makes the system insulating. The temperature dependence of photoemission spectra provides direct evidence for polaron formation. The remnant Fermi surface of the insulator is found to be the replica of the real Fermi surface in the metallic system.
authors.affiliation: Department of Physics, Tohoku University, Sendai 980-8578, Japan. raj@arpes.phys.tohoku.ac.jp
authors.forename: S
authors.initials: S
authors.lastname: Raj
authors.forename: D
authors.initials: D
authors.lastname: Hashimoto
authors.forename: H
authors.initials: H
authors.lastname: Matsui
authors.forename: S
authors.initials: S
authors.lastname: Souma
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Takahashi
authors.forename: D D
authors.initials: DD
authors.lastname: Sarma
authors.forename: Priya
authors.initials: P
authors.lastname: Mahadevan
authors.forename: S
authors.initials: S
authors.lastname: Oishi