Quasiparticle weight renormalization in the effective spin-fermion models

We consider the low binding energy part of ARPES of strongly correlated sys tems. We map from realistic Anderson-lattice p-d Hamiltonian into spin-ferm ion (Kondo-lattice) model and derive an analytical expression that relates photoemission intensity from p states with the spin-polaron spectral densit y in the spin-fermion model. The spin polaron problem is solved by a recent ly developed technique that combines Mori-Zwanzig projection method with se lf-consistent Born approximation. We show that photoemission intensity from the bare p-states has different omega-dependence compared the spectral den sity of effective fermions in Kondo-lattice. The difference leads to enhanc ement of coherent part of the photoemission spectrum. (C) 2000 Elsevier Sci ence B.V. All rights reserved.