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cond-mat.str-el2002
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…
cond-mat.supr-con2002
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…