Finite-momentum bound pairs of two electrons in an altermagnetic metal
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912832111509504 |
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| author | Hu, Hui Liu, Zhao Wang, Jia Liu, Xia-Ji |
| author_facet | Hu, Hui Liu, Zhao Wang, Jia Liu, Xia-Ji |
| contents | We solve the two-electron problem on a square lattice with $d$-wave altermagnetism, considering both on-site and nearest-neighbor attractive interactions. The altermagnetic spin-splitting in the single-particle dispersion naturally gives rise to a ground state of two-electron bound pairs with nonzero center-of-mass momentum. This finite-momentum pairing can be interpreted as a two-body mechanism underlying the recently proposed altermagnetism-induced Fulde--Ferrell--Larkin--Ovchinnikov (FFLO) superconducting state. Additionally, when the nearest-neighbor attraction is strong, the resulting finite-momentum bound pairs exhibit a mixture of both spin-singlet and spin-triplet characteristics, suggesting the possibility of unconventional superconductors, where spin-singlet and spin-triplet pairings coexist. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12905 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Finite-momentum bound pairs of two electrons in an altermagnetic metal Hu, Hui Liu, Zhao Wang, Jia Liu, Xia-Ji Superconductivity Strongly Correlated Electrons We solve the two-electron problem on a square lattice with $d$-wave altermagnetism, considering both on-site and nearest-neighbor attractive interactions. The altermagnetic spin-splitting in the single-particle dispersion naturally gives rise to a ground state of two-electron bound pairs with nonzero center-of-mass momentum. This finite-momentum pairing can be interpreted as a two-body mechanism underlying the recently proposed altermagnetism-induced Fulde--Ferrell--Larkin--Ovchinnikov (FFLO) superconducting state. Additionally, when the nearest-neighbor attraction is strong, the resulting finite-momentum bound pairs exhibit a mixture of both spin-singlet and spin-triplet characteristics, suggesting the possibility of unconventional superconductors, where spin-singlet and spin-triplet pairings coexist. |
| title | Finite-momentum bound pairs of two electrons in an altermagnetic metal |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.12905 |