Aspects of electron-phonon self-energy revealed from angle-resolved photoemission spectroscopy

Lattice contribution to the electronic self-energy in complex correlated oxides is a fascinating subject that has lately stimulated lively discussions. Expectations of electron-phonon self-energy effects for simpler materials, such as Pd and Al, have resulted in several misconceptions in strongly correlated oxides. Here, we analyze a number of arguments claiming that phonons cannot be the origin of certain self-energy effects seen in high-T-c cuprate superconductors via angle-resolved photoemission experiments, including the temperature dependence, doping dependence of the renormalization effects, the interband scattering in the bilayer systems, and impurity substitution. We show that in light of experimental evidences and detailed simulations, these arguments are not well founded.