46 citations · 120 across the 11 of their papers we have counts for
8 papers · 1 filter
Interpolative Approach for Solving Quantum Impurity Model Based on the Slave--Boson Mean--Field Approximation
V. Oudovenko, K. Haule, S. Y. Savrasov +2
A rational representation for the self-energy is explored to interpolate the solution of the Anderson impurity model in general orbitally degenerate case. Several constrains such a…
Two-scale analysis of the SU(N) Kondo Model
D. Villani, E. Lange, A. Avella +1
We show how to resolve coherent low-energy features embedded in a broad high-energy background by use of a fully self-consistent calculation for composite particle operators. The m…
The Conductivity Tensor for the Hubbard Model
F. Mancini, D. Villani
A new theoretical analysis of the current-charge and charge-charge propagators is presented for the Hubbard model, using the static approximation for the Composite Operator Method.…
Comment on "Symmetry properties of magnetization in the Hubbard model at finite temperature"
A. Avella, F. Mancini, D. Villani
The results of G. Su and M. Suzuki [Phys. Rev. B 54, 8291 (1996); ibidem 57, 13367 (1998)] for the spin and pseudo-spin symmetry properties of the Hubbard model are reexamined. We…
Thermodynamics of the 2D Hubbard model
F. Mancini, D. Villani, H. Matsumoto
A theoretical analysis of the thermodynamic response functions of the 2D single-band Hubbard model is realized by means of the composite operator method. It is shown that all the f…
The Hubbard model in the two-pole approximation
A. Avella, F. Mancini, D. Villani +2
The two-dimensional Hubbard model is analyzed in the framework of the two-pole expansion. It is demonstrated that several theoretical approaches, when considered at their lowest le…
Local properties in the two-dimensional t-t'-U model
Adolfo Avella, Ferdinando Mancini, Dario Villani +1
We have studied the t-t'-U model by means of the composite operator method. The effect of the bare diagonal hopping term t' that appears to be material dependent for high-Tc cuprat…
Incommensurate magnetism in cuprate materials
F. Mancini, D. Villani, H. Matsumoto
In the low doping region an incommensurate magnetic phase is observed in LSCO. By means of the composite operator method we show that the single-band 2D Hubbard model describes the…