Excitonic Quantum Anomalous Hall Effect in Collinear Magnets Without Spin-Orbit Coupling
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910050763669504 |
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| author | Liu, Xingxing Tan, ChaoYang Guo, Peng-Jie Lu, Zhong-Yi Liu, Zheng-Xin |
| author_facet | Liu, Xingxing Tan, ChaoYang Guo, Peng-Jie Lu, Zhong-Yi Liu, Zheng-Xin |
| contents | Spin-orbit coupling (SOC) is thought to be necessary in realizing quantum anomalous Hall (QAH) insulators in magnetic materials. In this Letter, we propose an exciton-condensation mechanism to realize QAH effect in collinear magnets with negligible spin-orbit coupling. This mechanism is realized by two steps: first prepare a spin-splitting nodal-ring band structure, and then gap out the nodal-ring via triplet exciton condensation. A nonzero Chern number can be obtained if the in-plane spin texture resulting from the triplet exciton condensation is noncollinear in momentum space. We show that the electron-phonon coupling can switch the spin texture from a colinear pattern to a noncolinear one and plays an essential role in realizing QAH effect. The above mechanism is not only suitable for ferrogmagnets but also applicable for altermagnets. Finally, through first-principles calculations we propose the bilayer material V2SeTeO to be a promising candidate of excitonic QAH insulator. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_12280 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Excitonic Quantum Anomalous Hall Effect in Collinear Magnets Without Spin-Orbit Coupling Liu, Xingxing Tan, ChaoYang Guo, Peng-Jie Lu, Zhong-Yi Liu, Zheng-Xin Mesoscale and Nanoscale Physics Strongly Correlated Electrons Spin-orbit coupling (SOC) is thought to be necessary in realizing quantum anomalous Hall (QAH) insulators in magnetic materials. In this Letter, we propose an exciton-condensation mechanism to realize QAH effect in collinear magnets with negligible spin-orbit coupling. This mechanism is realized by two steps: first prepare a spin-splitting nodal-ring band structure, and then gap out the nodal-ring via triplet exciton condensation. A nonzero Chern number can be obtained if the in-plane spin texture resulting from the triplet exciton condensation is noncollinear in momentum space. We show that the electron-phonon coupling can switch the spin texture from a colinear pattern to a noncolinear one and plays an essential role in realizing QAH effect. The above mechanism is not only suitable for ferrogmagnets but also applicable for altermagnets. Finally, through first-principles calculations we propose the bilayer material V2SeTeO to be a promising candidate of excitonic QAH insulator. |
| title | Excitonic Quantum Anomalous Hall Effect in Collinear Magnets Without Spin-Orbit Coupling |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.12280 |