Abstract
The zero-temperature spectral properties and Fermi surface (FS) anomalies ofhole-doped 2D Hubbard model with anisotropic nearest-neighbor hopping are evaluated using the perturbation theory. The nested sections of the FS, which are always present in the anisotropic model, are found to expand with the strength of Coulomb correlation U. The renormalized FS and the low-energy part of the density of states obtainedfor small anisotropy and large U are similar to those obtained for largeanisotropy and small U. The effect of correlation at low doping can bestbe described as an enhancement of the hopping anisotropy. The anomalous spectral features are mainly due to the van Hove singularities, which give rise to the momentum dependence of the self-energy.
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