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arXiv · 1707.06093

d-wave superconductivity in the presence of a near neighbor Coulomb repulsion

M. Jiang·U. R. Hahner·T. C. Schulthess·T. A. Maier
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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 near 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 $T_c$ 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 $T_c$ than for smaller $V$.

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M. Jiang, U. R. Hahner, T. C. Schulthess, T. A. Maier. 2017-07-19. d-wave superconductivity in the presence of a near neighbor Coulomb repulsion. https://doi.org/10.1103/physrevb.97.184507

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