Ferroelectric altermagnets (FEAMs) offer unique magnetoelectric coupling properties by combining the characteristics of both antiferromagnets and ferromagnets, yet their multifunctional electric control remains largely unexplored. Here, we introduce and investigate a scenario for the simultaneous electrical switching of electronic spin and magnonic chirality splitting in two-dimensional FEAMs. Based on the C2DB database, employing symmetry analysis and first-principles calculations, we study prototypical candidates CrPS3 and V2I2O2BrCl. We identify the mechanism: ferroelectricity arises from asymmetric displacements (P along z in CrPS3, V along the xy-direction in V2I2O2BrCl), which inherently couples electric polarization to both electronic and magnonic degrees of freedom by retaining [C2∣∣M] symmetry. Our calculations explicitly demonstrate that reversing the ferroelectric polarization concurrently switches the sign of the electronic spin splitting and chirality of magnonic modes. This shows these materials as dual-switchable FEAMs, enabling unified electrical manipulation of electron and magnon properties. A potentially experimentally detectable method via the magneto-optical Kerr effect was derived. This work provides a materials-specific realization and theoretical basis for designing novel electrically controlled multifunctional spintronic, spin caloritronic, and magnonic devices.
@article{arxiv.2504.19585,
title = {Two-dimensional Dual-Switchable Ferroelectric Altermagnets: Altering Electrons and Magnons},
author = {ShuaiYu Wang and Wei-Wei Wang and Jiaxuan Fan and Xiaodong Zhou and Xiao-Ping Li and Lei Wang},
journal= {arXiv preprint arXiv:2504.19585},
year = {2025}
}