Alterpiezoresponse in Two-Dimensional Lieb-Lattice Altermagnets

作者：Xilong Xu, Li Yang · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c02295 · 被引用次数：11 · 研究领域：Multiferroics and related materials、2D Materials and Applications、Advanced Condensed Matter Physics

Altermagnetism, featuring alternating spin structures in reciprocal space, has sparked growing interest. Here, we predict novel real-space alternative piezomagnetic and piezoelectric responses in an emerging altermagnetic family of Lieb lattices, specifically transition-metal chalcogenides M 2 WS 4 (M = Mn, Fe, Co). The unique S 4 T crystal-spin symmetry leads to distinct magnetic and electric responses depending on the direction of applied stress. When subjected to axial stress, they exhibit a giant piezomagnetic response, which is about 1–2 orders of magnitude larger than that of most piezomagnetic materials, while the residual C 2 symmetry suppresses the piezoelectric effect. In contrast, diagonal stress induces an imbalance of oppositely aligned electric-dipole moments and a significant piezoelectric response, while in-plane mirror symmetry inhibits the piezomagnetic effect. This alternative piezoresponse offers an unprecedented opportunity to precisely control electric and magnetic properties independently, opening new avenues for altermagnetic materials in high-fidelity multifunctional memory and sensor applications.