The van Hove scenario in the Hubbard model with correlated hopping

In order to describe the variety of results observed in different cuprates the original Hubbard model is too simple. In this paper we consider a gener alization of it, where correlated hopping acid intersite Coulomb interactio n are considered. By using the Composite Operator Method we analyze the eff ect of these extra terms on the Fermi surface and the relative position of the van Hove singularity with respect to the Fermi level. Comparison with r ecent ARPES data on La2-xSrxCuO4 is discussed. (C) 1999 Elsevier Science B. V. All rights reserved.