2 papers
cond-mat.str-el1998
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…
cond-mat.str-el1998
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…