Effect of the nearest-neighbor Coulomb interaction on d-wave Cooper pairing on a square lattice
Hanyou Chu
DOI 10.1103/PhysRevB.42.6196 · Physical Review B
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Abstract
The Cooper pairing on a square lattice in the extended Hubbard model that includes the nearest-neighbor Coulomb interaction is studied in the random-phase approximation. It is found that in both the antiferromagnetic and paramagnetic regimes, the d-wave attractive interaction can be drastically reduced with the introduction of a small nearest-neighbor interaction (V/U<10%). The reduction becomes stronger in both regimes as we move away from the phase transition and is the strongest in the antiferromagnetic regime.
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