Renormalization of spectral lineshape and dispersion below Tc in Bi2Sr2CaCu2O8+d
arXiv:cond-mat/0004482 · doi:10.1103/PhysRevLett.86.1070
Abstract
Angle-resolved photoemission (ARPES) data in the superconducting state of Bi2Sr2CaCu2O8+d show a kink in the dispersion along the zone diagonal, which is related via a Kramers-Kronig 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 lineshape throughout the zone indicate the presence of a new energy scale in the superconducting state.
New Figure 3 with expanded discussion