Enhancement of d-wave Pairing in Strongly Correlated Altermagnet
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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_ | 1866909615074050048 |
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| author | Li, Jianyu Liu, Ji Yang, Xiaosen Tang, Ho-Kin |
| author_facet | Li, Jianyu Liu, Ji Yang, Xiaosen Tang, Ho-Kin |
| contents | Altermagnetism, featuring momentum-dependent spin splitting without net magnetization, has attracted a growing interest for spintronics. We study a Fermi Hubbard model with altermagnetic order arising from the spin-anisotropic hopping near half-filling using constrained-path quantum Monte Carlo. Spin-dependent hopping breaks SU(2) symmetry and disrupts Fermi surface nesting, giving rise to an altermagnetic state with momentum-space spin splitting but no net magnetization. We find that increasing anisotropy suppresses long-range antiferromagnetic order and significantly enhances effective $d$-wave pairing correlations. Our results demonstrate a doping-free route to unconventional superconductivity mediated by short-range spin fluctuations in an altermagnetic background. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_12342 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhancement of d-wave Pairing in Strongly Correlated Altermagnet Li, Jianyu Liu, Ji Yang, Xiaosen Tang, Ho-Kin Strongly Correlated Electrons Superconductivity Altermagnetism, featuring momentum-dependent spin splitting without net magnetization, has attracted a growing interest for spintronics. We study a Fermi Hubbard model with altermagnetic order arising from the spin-anisotropic hopping near half-filling using constrained-path quantum Monte Carlo. Spin-dependent hopping breaks SU(2) symmetry and disrupts Fermi surface nesting, giving rise to an altermagnetic state with momentum-space spin splitting but no net magnetization. We find that increasing anisotropy suppresses long-range antiferromagnetic order and significantly enhances effective $d$-wave pairing correlations. Our results demonstrate a doping-free route to unconventional superconductivity mediated by short-range spin fluctuations in an altermagnetic background. |
| title | Enhancement of d-wave Pairing in Strongly Correlated Altermagnet |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2505.12342 |