Extended Hubbard Model with Unconventional Pairing in Two Dimensions

Details Extended Hubbard Model with Unconventional Pairing in Two Dimensions Extended Hubbard Model with Unconventional Pairing in Two Dimensions

2004-05-24

arxiv.org/abs/cond-mat/0405548v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures, v2: title is changed, new results are added, minor changes

Scientific paper

10.1103/PhysRevB.71.233102

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.

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