title: Tuning the hybridization at the surface of a heavy-fermion system.
abstract: Electron-hybridization phenomena in YbRh_{2}Si_{2} were probed by angle-resolved photoemission. It was shown that the Yb 4f-Rh 4d hybridization strength in the surface region of this heavy-fermion material can be varied by deposition of Ag. Site-specific charge transfer from adatoms leads to change of the energy overlap of the interacting states close to the Fermi energy. Our study demonstrates a new way to tune the hybridization between 4f and valence electrons as well as the induced strong correlation effects at the surface of heavy-fermion systems.
authors.affiliation: Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany. vyalikh@physik.phy.tu-dresden.de
authors.forename: D V
authors.initials: DV
authors.lastname: Vyalikh
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: Krellner
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: C
authors.initials: C
authors.lastname: Laubschat
authors.forename: M
authors.initials: M
authors.lastname: Shi
authors.forename: L
authors.initials: L
authors.lastname: Patthey
authors.forename: R
authors.initials: R
authors.lastname: Follath
authors.forename: S L
authors.initials: SL
authors.lastname: Molodtsov