Local properties and Density of States in the two-dimensional p-d Model

Details Local properties and Density of States in the two-dimensional p-d Model Local properties and Density of States in the two-dimensional p-d Model

2000-07-05

arxiv.org/abs/cond-mat/0007069v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 18 figures

Scientific paper

10.1103/PhysRevB.64.214515

The p-d model which well describes the CuO_2 planes of the high-Tc superconductors is studied by means of the Composite Operator Method (COM). The relevant quasi-particle excitations are represented by composite operators. As a result of taking into account spin excitations we find a p- like band near the Fermi level. The dispersion of this band gives a Fermi surface which is in good agreement with the experimental measurements. Due to the strong mixing of the relevant excitations, the spectral weight of this band is reduced and gives a large Fermi surface in the moderately doped region. The dependence of the calculated physical quantities on model parameters, temperature and doping, is in a very good agreement with the available Quantum Monte Carlo results.

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