Influence of incommensurate dynamic charge-density-wave scattering on the photoemission line shape of superconducting high-T-c cuprates - art. no. 224505

We show that the spectral line shape of superconducting La2-xSrxCuO4 (LSCO) and Bi2Sr2CaCu2O8+delta (Bi2212) can be well described by the coupling of the charge carriers to collective incommensurate charge density-wave (CDW) excitations. Our results imply that besides antiferromagnetic fluctuations also low-energy CDW modes can contribute to the observed dip-hump structure in the Bi2212 photoemission spectra. In case of underdoped LSCO we propose a possible interpretation of angle resolved photoemission spectroscopy dat a in terms of a grid pattern of fluctuating stripes where the charge and sp in scattering directions deviate by alpha = pi /4. Within this scenario we find that the spectral intensity along (0,0) --> (pi,pi) is strongly suppre ssed, consistent with recent photoemission experiments. In addition, the in commensurate charge-density-wave scattering leads to a significant broadeni ng of the quasiparticle peak around (pi ,0).