Abstract
We show that for low and moderate fillings the ground state of the two-dimensional Hubbard model with positive-U and nearest-neighbor hopping is unstable with respect to d-wave pairing with dxy symmetry of the gap wave function: Δ∼sinkxsinky. The inclusion of the next-neighbor hopping may either suppress the pairing or change the symmetry of the superconducting state.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 11163-11166 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 46 |
| Issue number | 17 |
| DOIs | |
| State | Published - 1992 |