The sudden change of the velocity, so-called "kink," of the dispersing peak in angle resolved photoelectron spectroscopy is a well-known feature in the high temperature superconducting cuprates. Currently, the origin of the kink is being much debated, but a consensus has not emerged yet. Here, we present a study of the momentum evolution of the kink structure from the nodal region towards the anti-nodal region, for optimally doped Bi2212 sample. We show that the observed temperature dependence of the kink structure in both regions of the momentum space is consistent with a scenario in which phonons contribute strongly to the kink.
@article{arxiv.cond-mat/0408475,
title = {Strong Influence of Phonons on the Electron Dynamics of Bi2212},
author = {G. -H. Gweon and S. Y. Zhou and A. Lanzara},
journal= {arXiv preprint arXiv:cond-mat/0408475},
year = {2009}
}