Apparent electron-phonon interaction in strongly correlated systems
arXiv:cond-mat/0407064 · doi:10.1103/PhysRevLett.93.237001
Abstract
We study the interaction of electrons with phonons in strongly correlated solids, having high-T_c cuprates in mind. Using sum-rules, we show that the apparent strength of this interaction strongly depends on the property studied. If the solid has a small fraction (doping) delta of charge carriers, the influence of the interaction on the phonon self-energy is reduced by a factor delta, while there is no corresponding reduction of the coupling seen in the electron self-energy. This supports the interpretation of recent photoemission experiments, assuming a strong coupling to phonons.
4 pages, RevTeX, 2 eps figures