Strong enhancement of d-wave superconductivity in an extended checkerboard Hubbard ladder
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909856003260416 |
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| author | Huang, Xichen He, Saisai Zhao, Jize Huang, Zhong-Bing |
| author_facet | Huang, Xichen He, Saisai Zhao, Jize Huang, Zhong-Bing |
| contents | By employing the density-matrix renormalization group method, we study an extended checkerboard Hubbard model on the two-leg ladder, which includes an intraplaquette nearest-neighbour attraction V. The simulated results show that V plays a significant role in enhancing the d-wave superconductivity when the electron density is close to half-filling. In the homogeneous case t'=t (t and t' are the intraplaquette and interplaquette hopping integrals), large critical |Vc| is required to induce the superconducting ground state. With decreasing t', |Vc| is substantially diminished and the pair state has a nearly C4 symmetry. In the extremely inhomogeneous case t'<0.2t, the system transits to the d-wave superconducting phase at V\sim-0.3t and V\sim-0.4t for U=8t and U=12t, respectively, accompanying with a shift of spin and single-particle excitations from gapless to gapped type. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_24415 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strong enhancement of d-wave superconductivity in an extended checkerboard Hubbard ladder Huang, Xichen He, Saisai Zhao, Jize Huang, Zhong-Bing Superconductivity Strongly Correlated Electrons By employing the density-matrix renormalization group method, we study an extended checkerboard Hubbard model on the two-leg ladder, which includes an intraplaquette nearest-neighbour attraction V. The simulated results show that V plays a significant role in enhancing the d-wave superconductivity when the electron density is close to half-filling. In the homogeneous case t'=t (t and t' are the intraplaquette and interplaquette hopping integrals), large critical |Vc| is required to induce the superconducting ground state. With decreasing t', |Vc| is substantially diminished and the pair state has a nearly C4 symmetry. In the extremely inhomogeneous case t'<0.2t, the system transits to the d-wave superconducting phase at V\sim-0.3t and V\sim-0.4t for U=8t and U=12t, respectively, accompanying with a shift of spin and single-particle excitations from gapless to gapped type. |
| title | Strong enhancement of d-wave superconductivity in an extended checkerboard Hubbard ladder |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.24415 |