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

ANDRES GRECO

SOLID STATE COMMUNICATIONS

Elsevier

Año: 2007 vol. 142 p. 318 - 322

0038-1098

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