QUASI-PARTICLE SPECTRA IN A T-J MODEL WITH ELECTRON-PHONON INTERACTIONS

The change of the spectra.1 properties of the single-particle Green's function due to a coupling to optical phonons is investigated for stro ngly correlated electrons. Except at the bottom of the band the quasip article pole is considerably broadened due to phonon-induced decay pro cesses, and phonon-satellite structures appear. The overall coherent b andwidth is, however, not significantly changed. The phonon induced ma ss renormalization of a single carrier which propagates in the t-J mod el on scale J is found to be much larger than in the corresponding unc orrelated model, except in the limit of J --> 0.