Superconductivity in the repulsive Hubbard model on different geometries induced by density-assisted hopping
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908872800731136 |
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| author | Lisandrini, Franco T. Orignac, Edmond Citro, Roberta Sheikhan, Ameneh Kollath, Corinna |
| author_facet | Lisandrini, Franco T. Orignac, Edmond Citro, Roberta Sheikhan, Ameneh Kollath, Corinna |
| contents | We study the effect of density-assisted hopping on different dimerized lattice geometries, such as bilayers and ladder structures. We show analytically that the density-assisted hopping induces an attractive interaction in the lower (bonding) band of the dimer structure and a repulsion in the upper (anti-bonding) band. Overcoming the onsite repulsion, this can lead to the appearance of superconductivity. The superconductivity depends strongly on the filling, and present a pairing structure more complex than s-wave pairing. Combining numerical and analytical methods such as the matrix product states ansatz, bosonization and perturbative calculations we map out the phase diagram of the two-leg ladder system and identify its superconducting phase. We characterize the transition from the non-density-assisted repulsive regime to the spin-gapped superconducting regime as a Berezinskii-Kosterlitz-Thouless transition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_09363 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconductivity in the repulsive Hubbard model on different geometries induced by density-assisted hopping Lisandrini, Franco T. Orignac, Edmond Citro, Roberta Sheikhan, Ameneh Kollath, Corinna Strongly Correlated Electrons Quantum Gases Superconductivity We study the effect of density-assisted hopping on different dimerized lattice geometries, such as bilayers and ladder structures. We show analytically that the density-assisted hopping induces an attractive interaction in the lower (bonding) band of the dimer structure and a repulsion in the upper (anti-bonding) band. Overcoming the onsite repulsion, this can lead to the appearance of superconductivity. The superconductivity depends strongly on the filling, and present a pairing structure more complex than s-wave pairing. Combining numerical and analytical methods such as the matrix product states ansatz, bosonization and perturbative calculations we map out the phase diagram of the two-leg ladder system and identify its superconducting phase. We characterize the transition from the non-density-assisted repulsive regime to the spin-gapped superconducting regime as a Berezinskii-Kosterlitz-Thouless transition. |
| title | Superconductivity in the repulsive Hubbard model on different geometries induced by density-assisted hopping |
| topic | Strongly Correlated Electrons Quantum Gases Superconductivity |
| url | https://arxiv.org/abs/2510.09363 |