t-J model one-electron renormalizations: High energy features in photoemission experiments on high Tc cuprates

Recent angle-resolved photoemission experiments on hole doped cuprates reported new and interesting high energy features which may be useful for understanding the electronic properties of these materials. Using a perturbative approach, which allows the calculation of dynamical properties in the t-J model, one-electron spectral properties were calculated. A strongly renormalized quasiparticle band near the Fermi surface and incoherent spectra at high energy were obtained. Among the different current experimental interpretations, the results obtained are closer to the interpretation given by Pan et al. [Z.-H. Pan, et al., cond-mat/0610442]. The self-energy shows large high energy contributions which are responsible for the incoherent structures shown by the spectral functions and the reduction of the quasiparticle weight and bandwidth. According to the calculation, collective charge fluctuations are the main source for the self-energy renormalizations. For testing whether the self-energy obtained is compatible with transport measurement the resistivity versus temperature relation was estimated.