Pairing of holes in a tight binding model with repulsive Coulomb interactions

Phys.Rev.B 43, 11400 (1991).

We consider a tight-binding model with two orbitals per site and purely repulsive Coulomb interactions. It is shown rigorously that in this model there exists a parameter regime in which pairing of hole carriers occurs. It is argued that the model is not totally unrealistic.


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