Pairing phase diagram for electron-doped cuprates in the square-lattice $t-U-V$ Hubbard model
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916804673142784 |
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| author | Cao, Zhangkai Tan, Shuning Liu, Ji Yang, Xiaosen Ying, Tao Tang, Ho-Kin Yip, Cho-Tung |
| author_facet | Cao, Zhangkai Tan, Shuning Liu, Ji Yang, Xiaosen Ying, Tao Tang, Ho-Kin Yip, Cho-Tung |
| contents | Motivated by significant discrepancies between experimental observations of electron-doped cuprates and numerical results of the Hubbard model, we investigate the role of nearest-neighbor (NN) electron interactions $V$ by studying the $t-U-V$ model on square lattices. Upon doping $δ$= 0.153, by using constrained path quantum Monte Carlo (CPQMC) method, we find that NN electron attraction $V$ can notably drive an exotic $p$-wave spin-triplet pairing, while the NN electron repulsion $V$ will suppress the $d_{x^2-y^2}$-wave ($d$-wave) pairing and triggers the $d_{xy}$-wave pairing. Especially in the intermediate coupling regime, as NN repulsion increases, the intensity of $d_{xy}$-wave pairing also increases, further suppressing the presence of $d$-wave pairing, which may help explain the notable suppression of $d$-wave pairing in electron-doped cuprate superconductors. Besides the pairing phase, we also find that the NN electron attraction $V$ has no significant effect on spin density wave (SDW) and charge density wave (CDW), but repulsion $V$ significantly enhanced CDW and suppressed SDW. Our study suggests the $t-U-V$ Hubbard model can serve as the minimal model to capture the essential physics of the electron-doped cuprates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_07079 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pairing phase diagram for electron-doped cuprates in the square-lattice $t-U-V$ Hubbard model Cao, Zhangkai Tan, Shuning Liu, Ji Yang, Xiaosen Ying, Tao Tang, Ho-Kin Yip, Cho-Tung Superconductivity Strongly Correlated Electrons Motivated by significant discrepancies between experimental observations of electron-doped cuprates and numerical results of the Hubbard model, we investigate the role of nearest-neighbor (NN) electron interactions $V$ by studying the $t-U-V$ model on square lattices. Upon doping $δ$= 0.153, by using constrained path quantum Monte Carlo (CPQMC) method, we find that NN electron attraction $V$ can notably drive an exotic $p$-wave spin-triplet pairing, while the NN electron repulsion $V$ will suppress the $d_{x^2-y^2}$-wave ($d$-wave) pairing and triggers the $d_{xy}$-wave pairing. Especially in the intermediate coupling regime, as NN repulsion increases, the intensity of $d_{xy}$-wave pairing also increases, further suppressing the presence of $d$-wave pairing, which may help explain the notable suppression of $d$-wave pairing in electron-doped cuprate superconductors. Besides the pairing phase, we also find that the NN electron attraction $V$ has no significant effect on spin density wave (SDW) and charge density wave (CDW), but repulsion $V$ significantly enhanced CDW and suppressed SDW. Our study suggests the $t-U-V$ Hubbard model can serve as the minimal model to capture the essential physics of the electron-doped cuprates. |
| title | Pairing phase diagram for electron-doped cuprates in the square-lattice $t-U-V$ Hubbard model |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.07079 |