Controlled pairing symmetries in a Fermi-Hubbard ladder with band flattening
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918261842509824 |
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| author | Mendonça, J. P. Biswas, S. Dziurawiec, M. Bhattacharya, U. Jachymski, K. Aidelsburger, M. Lewenstein, M. Maśka, M. M. Grass, T. |
| author_facet | Mendonça, J. P. Biswas, S. Dziurawiec, M. Bhattacharya, U. Jachymski, K. Aidelsburger, M. Lewenstein, M. Maśka, M. M. Grass, T. |
| contents | Band flattening has been identified as key ingredient to correlation phenomena in Moiré materials and beyond. Here, we examine strongly repulsive fermions on a ladder -- a minimal platform for unconventional $d$-wave pairing -- and show that flattening of the lower band through an additional diagonal hopping term produces non-Fermi liquid behavior, evidenced by the violation of Luttinger's theorem, as well as axial $d$-wave pairing correlations. Alternatively, plaquette ring exchange can also generate pairing, albeit with a distinct diagonal $d$-wave pairing symmetry. Hence, our finding showcases a competition of different unconventional pairing channels, and demonstrates via a simple model how band geometry can induce fermionic pairing. This offers broadly relevant insights for correlated flat-band systems, ranging from ultracold atoms to strongly interacting electrons in solids. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_20689 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Controlled pairing symmetries in a Fermi-Hubbard ladder with band flattening Mendonça, J. P. Biswas, S. Dziurawiec, M. Bhattacharya, U. Jachymski, K. Aidelsburger, M. Lewenstein, M. Maśka, M. M. Grass, T. Strongly Correlated Electrons Quantum Physics Band flattening has been identified as key ingredient to correlation phenomena in Moiré materials and beyond. Here, we examine strongly repulsive fermions on a ladder -- a minimal platform for unconventional $d$-wave pairing -- and show that flattening of the lower band through an additional diagonal hopping term produces non-Fermi liquid behavior, evidenced by the violation of Luttinger's theorem, as well as axial $d$-wave pairing correlations. Alternatively, plaquette ring exchange can also generate pairing, albeit with a distinct diagonal $d$-wave pairing symmetry. Hence, our finding showcases a competition of different unconventional pairing channels, and demonstrates via a simple model how band geometry can induce fermionic pairing. This offers broadly relevant insights for correlated flat-band systems, ranging from ultracold atoms to strongly interacting electrons in solids. |
| title | Controlled pairing symmetries in a Fermi-Hubbard ladder with band flattening |
| topic | Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2512.20689 |