46 citations · 106 across the 7 of their papers we have counts for
7 papers
The half-filled Hubbard chain in the Composite Operator Method: A comparison with Bethe Ansatz
M. M. Sanchez, A. Avella, F. Mancini
The one-dimensional Hubbard model at half-filling is studied in the framework of the Composite Operator Method using a static approximation. A solution characterized by strong anti…
Symmetries in the Physics of Strongly Correlated Electronic Systems
F. Mancini, A. Avella
Strongly correlated electron systems require the development of new theoretical schemes in order to describe their unusual and unexpected properties. The usual perturbation schemes…
Conservation of the spectral moments in the n-pole approximation
F. Mancini
A formulation of the Green's function method is presented in the n-pole approximation. Without referring to a specific model we give a general scheme of calculations that easily pe…
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…
The two-dimensional t-t'-U model as a minimal model for cuprate materials
Adolfo Avella, Ferdinando Mancini, Dario Villani +1
The addition to the Hubbard Hamiltonian of a t' diagonal hopping term, which is considered to be material dependent for high-Tc cuprate superconductors, is generally suggested to o…