SHADOW BANDS IN MODELS OF CORRELATED ELECTRONS

A consequence of strong antiferromagnetic correlations in models of hi gh-Tc cuprates-is the appearance in photoemission (PES) calculations o f considerable more weight above the Fermi momentum (PF) than expected for non-interacting electrons. This effect, qualitatively discussed b y Kampf and Schrieffer under the name of ''shadow bands'', is here qua ntitatively analyzed in the two dimensional Hubbard and t-J models usi ng Monte Carlo and exact diagonalization techniques in the realistic s trong coupling regime.