Robustness of the Van Hove scenario for high-Tc superconductors -: art. no. 076401

The pinning of the Fermi level to the Van Hove singularity and the formation of flat bands in the two-dimensional t-t(') Hubbard model is investigated by the renormalization group technique. The Van Hove scenario of non-Fermi-liquid behavior for high-T-c compounds can take place in a broad enough range of the hole concentrations. The results are in qualitative agreement with the recent angle-resolved photoemission spectroscopy data on La2CuO4.