The odd-parity altermagnetism induced reconstruction of the Chern-insulating phase in Haldane-Hubbard model
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arXiv
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| Format: | Preprint |
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2026
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| author | Zeng, Minghuan Qin, Zheng Qin, Ling Feng, Shiping Wu, Lin Xu, Dong-Hui Wang, Rui |
| author_facet | Zeng, Minghuan Qin, Zheng Qin, Ling Feng, Shiping Wu, Lin Xu, Dong-Hui Wang, Rui |
| contents | Odd-parity altermagnetism(ALM) extends compensated collinear magnetism beyond the even-parity spin splitting of conventional altermagnets, but its role in correlated topological phases remains largely unexplored. Using the cluster slave-spin method, we show that the odd-parity ALM appearing in the ALM Chern-insulating phase of Haldane-Hubbard model significantly reconstructs the local topology in the conventional Chern-insulating phase, while the total Chern number remains unchanged compared to the Chern-insulating phase. The Berry curvature becomes spin and valley selective; zigzag ribbons develop chiral-symmetry-breaking edge states; while armchair ribbons remain inversion symmetric. The optical response mirrors this separation between the local reconstruction and the global topology: low-energy spectra are governed by quasiparticles near the gap, whereas the low-frequency Hall conductivity stays quantized, $σ_{\rm T\uparrow}(Ω\to 0)=σ_{\rm T\downarrow}(Ω\to 0)=e^2/h$. These results establish the Haldane-Hubbard model as a minimal correlated platform for odd-parity altermagnetic topology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25537 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The odd-parity altermagnetism induced reconstruction of the Chern-insulating phase in Haldane-Hubbard model Zeng, Minghuan Qin, Zheng Qin, Ling Feng, Shiping Wu, Lin Xu, Dong-Hui Wang, Rui Strongly Correlated Electrons Odd-parity altermagnetism(ALM) extends compensated collinear magnetism beyond the even-parity spin splitting of conventional altermagnets, but its role in correlated topological phases remains largely unexplored. Using the cluster slave-spin method, we show that the odd-parity ALM appearing in the ALM Chern-insulating phase of Haldane-Hubbard model significantly reconstructs the local topology in the conventional Chern-insulating phase, while the total Chern number remains unchanged compared to the Chern-insulating phase. The Berry curvature becomes spin and valley selective; zigzag ribbons develop chiral-symmetry-breaking edge states; while armchair ribbons remain inversion symmetric. The optical response mirrors this separation between the local reconstruction and the global topology: low-energy spectra are governed by quasiparticles near the gap, whereas the low-frequency Hall conductivity stays quantized, $σ_{\rm T\uparrow}(Ω\to 0)=σ_{\rm T\downarrow}(Ω\to 0)=e^2/h$. These results establish the Haldane-Hubbard model as a minimal correlated platform for odd-parity altermagnetic topology. |
| title | The odd-parity altermagnetism induced reconstruction of the Chern-insulating phase in Haldane-Hubbard model |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.25537 |