Superconductivity in the Bilayer Two-orbital Hubbard Model
Fuente:
arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866909451852709888 |
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| author | Zheng, Yao-Yuan Wú, Wéi |
| author_facet | Zheng, Yao-Yuan Wú, Wéi |
| contents | Motivated by the recently discovered high $T_c$ nickelate superconductor $\mathrm{La_3Ni_2O_7}$, we investigate superconductivity in a two dimensional Hubbard model on square lattice that consists of two layers of hybridizing $d_{x^2-y^2}$ and $d_{z^2}$ orbitals. Employing cluster dynamical mean-field theory, we establish phase diagrams resolving the crucial dependence of superconducting $T_c$ on electron hybridization $V$ between $d_{x^2-y^2}$ and $d_{z^2}$ orbitals at the same layer, and on the hopping $t_{\perp}$ between two $d_{z^2}$ orbitals at different layers. $V$ and $t_{\perp}$ are presumably linked to the pairing phase coherence, and "pairing glue" of the system respectively. Our result favors a two-component theory explanation of superconductivity in a composite system. The influence of the pseudogap effect and Hund's coupling on superconductivity are discussed, and also the implication of our result to the understanding of $\mathrm{La_3Ni_2O_7}$ superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_03605 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Superconductivity in the Bilayer Two-orbital Hubbard Model Zheng, Yao-Yuan Wú, Wéi Strongly Correlated Electrons Superconductivity Motivated by the recently discovered high $T_c$ nickelate superconductor $\mathrm{La_3Ni_2O_7}$, we investigate superconductivity in a two dimensional Hubbard model on square lattice that consists of two layers of hybridizing $d_{x^2-y^2}$ and $d_{z^2}$ orbitals. Employing cluster dynamical mean-field theory, we establish phase diagrams resolving the crucial dependence of superconducting $T_c$ on electron hybridization $V$ between $d_{x^2-y^2}$ and $d_{z^2}$ orbitals at the same layer, and on the hopping $t_{\perp}$ between two $d_{z^2}$ orbitals at different layers. $V$ and $t_{\perp}$ are presumably linked to the pairing phase coherence, and "pairing glue" of the system respectively. Our result favors a two-component theory explanation of superconductivity in a composite system. The influence of the pseudogap effect and Hund's coupling on superconductivity are discussed, and also the implication of our result to the understanding of $\mathrm{La_3Ni_2O_7}$ superconductivity. |
| title | Superconductivity in the Bilayer Two-orbital Hubbard Model |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2312.03605 |