title: Renormalization of spectral line shape and dispersion below Tc in Bi2Sr2CaCu2O8+delta.
abstract: Angle-resolved photoemission data in the superconducting state of Bi2Sr2CaCu2O8+delta show a kink in the dispersion along the zone diagonal, which is related via a Kramers-Krönig analysis to a drop in the low energy scattering rate. As one moves towards (pi,0), this kink evolves into a spectral dip. The occurrence of these anomalies in the dispersion and line shape throughout the zone indicates the presence of a new energy scale in the superconducting state.
authors.affiliation: Department of Physics, University of Illinois at Chicago, 60607, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kaminski
authors.forename: M
authors.initials: M
authors.lastname: Randeria
authors.forename: J C
authors.initials: JC
authors.lastname: Campuzano
authors.forename: M R
authors.initials: MR
authors.lastname: Norman
authors.forename: H
authors.initials: H
authors.lastname: Fretwell
authors.forename: J
authors.initials: J
authors.lastname: Mesot
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Takahashi
authors.forename: K
authors.initials: K
authors.lastname: Kadowaki