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arXiv · 2508.12770

Chiral Altermagnetic Magnetoelectrics

Chengwu Xie·Weizhen Meng·Zhenzhou Guo·Xiaodong Zhou·Shifeng Qian·Tie Yang·Wenhong Wang·Zhenxiang Cheng·Xiaotian Wang
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Abstract

In this work, we introduce a new class of chiral altermagnetic magnetoelectrics in structurally chiral, nonpolar altermagnetic systems and identify the experimentally well-characterized three-dimensional metal-organic framework K[Co(HCOO)$_3$] as a promising material platform. K[Co(HCOO)$_3$] exhibits chirality-locked \emph{g}-wave altermagnetic spin splitting together with dual-mode switchable electric polarization controlled by N\'eel-vector reorientation and structural chirality. Specifically, N\'eel-vector reorientation generates a finite electric polarization and reverses its sign, whereas chirality switching between left- and right-handed enantiomers produces an additional sign reversal. The associated electronic and optical responses provide effective readout channels for these switchable states. Our results establish chiral altermagnetic magnetoelectrics as a promising route to chirality- and N\'eel-vector-controlled nonvolatile multifunctional spintronics.

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Chengwu Xie, Weizhen Meng, Zhenzhou Guo, Xiaodong Zhou, Shifeng Qian, Tie Yang, Wenhong Wang, Zhenxiang Cheng, Xiaotian Wang. 2025-08-18. Chiral Altermagnetic Magnetoelectrics. https://arxiv.org/abs/2508.12770

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