Nearest-neighbour Attraction Stabilizes Staggered Currents in the 2D Hubbard Model

Details Nearest-neighbour Attraction Stabilizes Staggered Currents in the 2D Hubbard Model Nearest-neighbour Attraction Stabilizes Staggered Currents in the 2D Hubbard Model

2001-02-28

arxiv.org/abs/cond-mat/0102527v3

Phys. Rev. B, vol. 64, 220509/1-4 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages with 5 .eps files (Typos in text are corrected)

Scientific paper

10.1103/PhysRevB.64.220509

Using a strong-coupling approach, we show that staggered current vorticity does not obtain in the repulsive 2D Hubbard model for large on-site Coulomb interactions, as in the case of the copper oxide superconductors. This trend also persists even when nearest-neighbour repulsions are present. However, staggered flux ordering emerges {\bf only} when attractive nearest-neighbour Coulomb interactions are included. Such ordering opens a gap along the $(\pi,0)-(0,\pi)$ direction and persists over a reasonable range of doping.

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