Enhanced superconductivity by near-neighbor attraction in the doped Hubbard model

Abstract

Recent experiment has unveiled an anomalously strong electron-electron attraction in one-dimensional copper-oxide chain Ba${}_{2-x}$Sr${}_x$CuO${}_{3+\delta }$. While the near-neighbor electron attraction $V$ in the one-dimensional extended Hubbard chain has been examined recently, its effect in the Hubbard model beyond the one-dimensional chain remains unclear. We report a density-matrix renormalization group study of the extended Hubbard model on long four-leg cylinders on the square lattice. We find that the near-neighbor electron attraction $V$ can notably enhance the long-distance superconducting correlations while simultaneously suppressing the charge-density-wave correlations. Specifically, for a modestly strong electron attraction, the superconducting correlations become dominant over the CDW correlations with a Luttinger exponent $K_{sc}\sim 1$ and strong divergent superconducting susceptibility. Our results provide a promising way to realize long-range superconductivity in the doped Hubbard model in two dimensions. The relevance of our numerical results to cuprate materials is also discussed.

arXiv comment6 pages, 5 figures

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• Density Matrix Renormalization Group study of superconducting pairing near the quarter-filled Wigner crystal
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• Interfacial Polarons Driven by Charge Transfer In WSe2/Cuprate Superconductor Systems
• Itinerant magnetism in Hubbard models with long-range interactions
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• Theory of ab initio downfolding with arbitrary range electron-phonon coupling
• Order by projection in single-band Hubbard model: a DMRG study