Spectral properties of incommensurate CDW scattering in cuprates

Motivated by the observation of periodic charge modulations in Bi2Sr2CaCu2O8+δ by recent STM experiments we show that the associated collective charge dynamics can also account for the peculiar features as seen in ARPES experiments. Especially the famous peak-dip-hump structure of the line shape and the related kink in the dispersion can be well described by the coupling of the charge carriers to dynamical incommensurate CDW fluctuations. From a comparison with ARPES data we obtain a mode frequency which decreases towards optimal doping thus strongly supporting the existence of a quantum critical point around this concentration. Finally we extract the temperature dependence of the CDW mode from ARPES experiments and extend this approach in order to include the recently observed bilayer splitting