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arXiv · 2511.06389

Ultrafast symmetry modulation and induced magnetic excitation in the Kagome metal RbV3Sb5

Mengxue Guan·Xiaodong Zhou·Jingyi Duan·Chaoxi Cui·Wei Jiang·Zeying Zhang·Binhua Zhang·Zhengwei Nie·Xun Shi·Zhiwei Wang·Yugui Yao
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Abstract

Light-matter interaction in frustrated Kagome metals enables access to hidden quantum states, yet the microscopic origin of symmetry breaking under ultrafast excitation remains elusive. Here, we uncover a microscopic mechanism for laser-induced symmetry breaking in RbV3Sb5 through first-principles real-time simulations. Selective excitation of a single-QM phonon mode dynamically breaks both rotational and time-reversal symmetries within the 2X2X1 charge density wave (CDW) superlattice. The resulting anisotropic lattice distortion lifts geometric frustration and stabilizes a nonequilibrium ferrimagnetic phase, accompanied by a sizable intrinsic anomalous Hall effect. Distinct from prior interpretations based on orbital antiferromagnetism or extrinsic perturbations, our findings reveal a spin-driven pathway for symmetry breaking under strong optical fields. These results provide a microscopic foundation for exploring how spin, lattice and charge degrees of freedom are intertwined in nonequilibrium correlated states.

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Mengxue Guan, Xiaodong Zhou, Jingyi Duan, Chaoxi Cui, Wei Jiang, Zeying Zhang, Binhua Zhang, Zhengwei Nie, Xun Shi, Zhiwei Wang, Yugui Yao. 2025-11-09. Ultrafast symmetry modulation and induced magnetic excitation in the Kagome metal RbV3Sb5. https://arxiv.org/abs/2511.06389

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