d-wave superconductivity in the presence of nearest-neighbor Coulomb repulsion
M. Jiang, U. R. Hähner, T. C. Schulthess, T. A. Maier
DOI 10.1103/PhysRevB.97.184507 · Physical Review B
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Abstract
Dynamic cluster quantum Monte Carlo calculations for a doped two-dimensional extended Hubbard model are used to study the stability and dynamics of d-wave pairing when a nearest-neighbor Coulomb repulsion V is present in addition to the on-site Coulomb repulsion U. We find that d-wave pairing and the superconducting transition temperature Tc are only weakly suppressed as long as V does not exceed U/2. This stability is traced to the strongly retarded nature of pairing that allows the d-wave pairs to minimize the repulsive effect of V. When V approaches U/2, large momentum charge fluctuations are found to become important and to give rise to a more rapid suppression of d-wave pairing and Tc than for smaller V.
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