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Journal Article

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

A recent experiment has unveiled an anomalously strong electron-electron attraction in the one-dimensional copper-oxide chain Ba2βˆ’π‘₯⁒Srπ‘₯⁒CuO3+𝛿. While the effect of the near-neighbor electron attraction π‘‰ in the one-dimensional extended Hubbard chain has been examined recently, its effect in the Hubbard model beyond the one-dimensional chain remains unclear. Here, 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 π‘‰ can notably enhance the long-distance superconducting correlations while simultaneously suppressing the charge-density-wave (CDW) correlations. Specifically, for a modestly strong electron attraction, the superconducting correlations become dominant over the CDW correlations with a Luttinger exponent πΎπ‘ β’π‘βˆΌ1 and strong divergent superconducting susceptibility. Our results provide a promising way to realize long-range superconductivity in the doped Hubbard model. The relevance of our numerical results to cuprate materials is also discussed.

Author(s)
Cheng Peng
Yao Wang
Jiajia Wen
Young S. Lee
Thomas P. Devereaux
Hong-Chen Jiang
Journal Name
Phys. Rev.B
Publication Date
May 3, 2023
DOI
10.1103/PhysRevB.107.L201102