Superconductivity with s and p-symmetries in an extended Hubbard model with correlated hopping

Details Superconductivity with s and p-symmetries in an extended Hubbard model with correlated hopping Superconductivity with s and p-symmetries in an extended Hubbard model with correlated hopping

1998-03-03

arxiv.org/abs/cond-mat/9803034v1

European Physical Journal B 5, 371 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

Latex file, 14 pages, 2 postscript figures

Scientific paper

10.1007/s100510050456

We consider a generalized Hubbard model with on-site and nearest-neighbour repulsions U and V respectively, and nearest-neighbour hopping for spin up (down) which depends on the total occupation n_b of spin down (up) electrons on both sites involved. The hopping parameters are t_{AA}, t_{AB} and t_{BB} for n_b=0,1,2 respectively. We briefly summarize results which support that the model exhibits s-wave superconductivity for certain parameters and extend them by studying the Berry phases. Using a generalized Hartree-Fock(HF) BCS decoupling of the two and three-body terms, we obtain that at half filling, for t_{AB}

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