title: Transfer of spectral weight and symmetry across the metal-insulator transition in VO(2).
abstract: We present a detailed study of the valence and conduction bands of VO2 across the metal-insulator transition using bulk-sensitive photoelectron and O K x-ray absorption spectroscopies. We observe a giant transfer of spectral weight with distinct features that require an explanation which goes beyond the Peierls transition model as well as the standard single-band Hubbard model. Analysis of the symmetry and energies of the bands reveals the decisive role of the V 3d orbital degrees of freedom. Comparison to recent realistic many body calculations shows that much of the k dependence of the self-energy correction can be cast within a dimer model.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
authors.forename: T C
authors.initials: TC
authors.lastname: Koethe
authors.forename: Z
authors.initials: Z
authors.lastname: Hu
authors.forename: M W
authors.initials: MW
authors.lastname: Haverkort
authors.forename: C
authors.initials: C
authors.lastname: Schüssler-Langeheine
authors.forename: F
authors.initials: F
authors.lastname: Venturini
authors.forename: N B
authors.initials: NB
authors.lastname: Brookes
authors.forename: O
authors.initials: O
authors.lastname: Tjernberg
authors.forename: W
authors.initials: W
authors.lastname: Reichelt
authors.forename: H H
authors.initials: HH
authors.lastname: Hsieh
authors.forename: H-J
authors.initials: HJ
authors.lastname: Lin
authors.forename: C T
authors.initials: CT
authors.lastname: Chen
authors.forename: L H
authors.initials: LH
authors.lastname: Tjeng