Evolution of magnetic correlation in doped Hubbard model with altermagnetic spin splitting
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866908882864963584 |
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| author | Li, Yinlong Mushtaq, Rana Imran Liu, Ji Yu, Wing Chi Yang, Xiaosen Yip, Cho-Tung Tang, Ho-Kin |
| author_facet | Li, Yinlong Mushtaq, Rana Imran Liu, Ji Yu, Wing Chi Yang, Xiaosen Yip, Cho-Tung Tang, Ho-Kin |
| contents | The evolution of magnetic correlation in strongly correlated electron systems with altermagentic spin splitting remains largely unexplored. Here we investigate how spin splitting generated by spin-dependent next-nearest-neighbor hopping t' reshapes the Fermi surface nesting and van Hove singularities in the two-dimensional square-lattice Hubbard model, leading evolution of magnetic instabilities. Using the constrained-path quantum Monte Carlo method, we find the dominant magnetic correlation as functions of the filling and t'/t by computing the momentum-resolved spin structure factor. The analysis reveals a transition from antiferromagnetic (π,π) order in the isotropic, half-filled system to non-collinear spiral (π,q) order upon increasing the spin-dependent anisotropy or doping away from half-filling, ultimately entering a short-range correlation regime where stripe and spiral correlation coexist. These findings highlight a possible route to realizing spiral correlation in altermagnetic systems, potentially providing a platform for spintronic devices that exploit non-collinear spin textures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_13643 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Evolution of magnetic correlation in doped Hubbard model with altermagnetic spin splitting Li, Yinlong Mushtaq, Rana Imran Liu, Ji Yu, Wing Chi Yang, Xiaosen Yip, Cho-Tung Tang, Ho-Kin Strongly Correlated Electrons The evolution of magnetic correlation in strongly correlated electron systems with altermagentic spin splitting remains largely unexplored. Here we investigate how spin splitting generated by spin-dependent next-nearest-neighbor hopping t' reshapes the Fermi surface nesting and van Hove singularities in the two-dimensional square-lattice Hubbard model, leading evolution of magnetic instabilities. Using the constrained-path quantum Monte Carlo method, we find the dominant magnetic correlation as functions of the filling and t'/t by computing the momentum-resolved spin structure factor. The analysis reveals a transition from antiferromagnetic (π,π) order in the isotropic, half-filled system to non-collinear spiral (π,q) order upon increasing the spin-dependent anisotropy or doping away from half-filling, ultimately entering a short-range correlation regime where stripe and spiral correlation coexist. These findings highlight a possible route to realizing spiral correlation in altermagnetic systems, potentially providing a platform for spintronic devices that exploit non-collinear spin textures. |
| title | Evolution of magnetic correlation in doped Hubbard model with altermagnetic spin splitting |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.13643 |