6 papers
Antiferromagnetism in the Exact Ground State of the Half Filled Hubbard Model on the Complete-Bipartite Graph
Gianluca Stefanucci, Michele Cini
As a prototype model of antiferromagnetism, we propose a repulsive Hubbard Hamiltonian defined on a graph with and bonds…
The "W=0" Pairing Mechanism from Repulsive Interactions in Symmetric 2d Models
Michele Cini, Gianluca Stefanucci
In two-dimensional systems possessing a high degree of symmetry, the repulsive electron-electron interaction produces a pairing force; the mechanism would fail in the presence of s…
Auger spectroscopy of strongly correlated systems: present status and future trends
Claudio Verdozzi, Michele Cini, Andrea Marini
We review the Cini-Sawatzky approach to the line shape analysis of Auger CVV transitions, in its basic and original formulation. Then, several extensions of the theory are reviewed…
Canonical Transformation of the Hubbard Model and W=0 Pairing: Comparison with Exact Diagonalization Results
Michele Cini, Adalberto Balzarotti, Raffaella Brunetti +2
We have recently developed a canonical transformation of the Hubbard and related models, valid for systems of arbitrary size and for the full plane; this is particularly suited to…
Charge Conjugation and Pairing in a model CuO Cluster
Michele Cini, Adalberto Balzarotti, Gianluca Stefanucci
Highly-symmetric three-band Hubbard Cu-O clusters have peculiar properties when the hole number is such that they admit W=0 hole pairs. These are two-hole eigenstates of the on-sit…
Pairing in the Three-Band Hubbard Model of the Cu-O Plane
Michele Cini, Gianluca Stefanucci, Adalberto Balzarotti
By a canonical transformation of the three-band Hubbard model, we introduce an effective Hamiltonian for the propagation of two holes doped into the ground state of the Cu-O plane.…