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arXiv · 2603.12280

Excitonic Quantum Anomalous Hall Effect in Collinear Magnets Without Spin-Orbit Coupling

Xingxing Liu·ChaoYang Tan·Peng-Jie Guo·Zhong-Yi Lu·Zheng-Xin Liu
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Abstract

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.

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Xingxing Liu, ChaoYang Tan, Peng-Jie Guo, Zhong-Yi Lu, Zheng-Xin Liu. 2026-03-04. Excitonic Quantum Anomalous Hall Effect in Collinear Magnets Without Spin-Orbit Coupling. https://arxiv.org/abs/2603.12280

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