title: Energy dispersion of 4f-derived emissions in photoelectron spectra of the heavy-fermion compound YbIr2Si2.
abstract: Angle-resolved photoemission spectra of the heavy-fermion system YbIr(2)Si(2) are reported that reveal strong momentum (k) dependent splittings of the 4f(13) bulk and surface emissions around the expected intersection points of the 4f final states with valence bands in the Brillouin zone. The obtained dispersion is explained in terms of a simplified periodic Anderson model by a k dependence of the electron hopping matrix element disregarding clearly interpretation in terms of a single-impurity model.
authors.affiliation: Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Danzenbächer
authors.forename: Yu
authors.initials: Y
authors.lastname: Kucherenko
authors.forename: C
authors.initials: C
authors.lastname: Laubschat
authors.forename: D V
authors.initials: DV
authors.lastname: Vyalikh
authors.forename: Z
authors.initials: Z
authors.lastname: Hossain
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou
authors.forename: W L
authors.initials: WL
authors.lastname: Yang
authors.forename: N
authors.initials: N
authors.lastname: Mannella
authors.forename: Z
authors.initials: Z
authors.lastname: Hussain
authors.forename: Z-X
authors.initials: ZX
authors.lastname: Shen
authors.forename: S L
authors.initials: SL
authors.lastname: Molodtsov