d-Wave Pairing in the Presence of Long-Range Coulomb Interactions
G. Esirgen, H. -B. Schüttler, N. E. Bickers
Abstract
The one-band extended Hubbard model in two dimensions near band-filling 1/2 is solved in the fluctuation exchange approximation, including the long-range (1/r) part of the Coulomb interaction, up to 4th neighbor distance. Our results suggest that d(x2 - y2) pairing in the Hubbard model is robust against the inclusion of long-range Coulomb interactions with moderate 1st neighbor repulsion strength V1. d(x2 - y2) pairing is suppressed only at large V1 (>~ 0.25U-0.4U), due to incipient charge density wave instabilities.
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