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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2605.25128 |
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| _version_ | 1866916043338809344 |
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| author | Che, Yixuan Xu, Peibo Lv, Haifeng Wu, Xiaojun Yang, Jinlong |
| author_facet | Che, Yixuan Xu, Peibo Lv, Haifeng Wu, Xiaojun Yang, Jinlong |
| contents | Altermagnetism is characterized by even-parity spin-momentum locking in spin-split bands despite zero net magnetization and negligible spin-orbit coupling. Here, we formulate a microscopic framework that links altermagnetic splitting in two-dimensional (2D) square lattices to orbital character. Using tight-binding models and symmetry analysis, we show that, within the minimal antiferromagnetic square-lattice model, single-orbital lattices remain spin-degenerate, whereas interwoven dual-orbital configurations lift Kramers degeneracy and generate d-wave or g-wave altermagnetic states. The spin-splitting originates from orbital anisotropy in the same-spin hopping channels. Guided by this framework, we identify M-TCNX (M = Cr, Mn, Fe; TCNX = TCNE, TCNQ) metal-organic framework monolayers with mcm topology as candidate g-wave altermagnets. Our work provides a symmetry-explicit wavefunction-level design framework for orbital-controlled altermagnetism in 2D square lattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_25128 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Orbital-Engineered Altermagnetism in Two-Dimensional Square Lattices Che, Yixuan Xu, Peibo Lv, Haifeng Wu, Xiaojun Yang, Jinlong Materials Science Chemical Physics Altermagnetism is characterized by even-parity spin-momentum locking in spin-split bands despite zero net magnetization and negligible spin-orbit coupling. Here, we formulate a microscopic framework that links altermagnetic splitting in two-dimensional (2D) square lattices to orbital character. Using tight-binding models and symmetry analysis, we show that, within the minimal antiferromagnetic square-lattice model, single-orbital lattices remain spin-degenerate, whereas interwoven dual-orbital configurations lift Kramers degeneracy and generate d-wave or g-wave altermagnetic states. The spin-splitting originates from orbital anisotropy in the same-spin hopping channels. Guided by this framework, we identify M-TCNX (M = Cr, Mn, Fe; TCNX = TCNE, TCNQ) metal-organic framework monolayers with mcm topology as candidate g-wave altermagnets. Our work provides a symmetry-explicit wavefunction-level design framework for orbital-controlled altermagnetism in 2D square lattices. |
| title | Orbital-Engineered Altermagnetism in Two-Dimensional Square Lattices |
| topic | Materials Science Chemical Physics |
| url | https://arxiv.org/abs/2605.25128 |