Extended Hubbard Model with Unconventional Pairing in Two Dimensions
Strongly Correlated Electrons
2009-11-10 v2 Superconductivity
Abstract
We rigorously prove that an extended Hubbard model with attraction in two dimensions has an unconventional pairing ground state for any electron filling. The anisotropic spin-0 or anisotropic spin-1 pairing symmetry is realized, depending on a phase parameter characterizing the type of local attractive interactions. In both cases the ground state is unique. It is also shown that in a special case, where there are no electron hopping terms, the ground state has Ising-type N\'eel order at half-filling, when on-site repulsion is furthermore added. Physical applications are mentioned.
Cite
@article{arxiv.cond-mat/0405548,
title = {Extended Hubbard Model with Unconventional Pairing in Two Dimensions},
author = {Akinori Tanaka and Masanori Yamanaka},
journal= {arXiv preprint arXiv:cond-mat/0405548},
year = {2009}
}
Comments
5 pages, 2 figures, v2: title is changed, new results are added, minor changes