Self-consistent hybridization expansions for static properties of the Anderson impurity model

摘要: Building an effective Hamiltonian utilizing a projector-operator procedure, we derive approximation based on self-consistent hybridization expansion to study the ground state properties of Anderson impurity model. We applied general case finite Coulomb repulsion U, extending previous work with same formalism in infinite-U case. The energy and their related zero temperature are accurately obtained which U is large enough, but still finite, as compared rest scales involved results for valence exact that obtain from equations derived using Bethe ansatz perturbative approach. magnetization magnetic susceptibility also results. In order do this comparison, show how regularize integral necessary calculate valence, arbitrary values parameters.