Stacking, Strain-Engineering Induced Altermagnetism, Multipiezo Effect, and Topological State in Two-Dimensional Materials

TL;DR

This paper explores how stacking and strain engineering in two-dimensional materials can induce altermagnetism, multipiezo effects, and topological states, advancing potential applications in valleytronics and spintronics.

Contribution

It proposes a mechanism to realize altermagnetism, multipiezo effects, and topological phases in 2D materials through stacking and strain engineering, analyzing symmetry and phase transitions.

Findings

Stacking can transform antiferromagnetism to altermagnetism.

Strain induces multipiezo effects and topological phases.

Symmetry analysis links spin splitting to specific symmetries.

Abstract

Altermagnetism, as a newly identified form of unconventional antiferromagnetism, enables the removal of spin degeneracy in the absence of net magnetization that provides a platform for the low power consumption and ultra-fast device applications. However, the rare attention has been paid to the relationship between stacking, strain and altermagnet, multipiezo effect and topological state. Here, we propose a mechanism to realize the altermagnet, multipiezo effect, and topological state in two-dimensional materials by the stacking and strain engineering. Based on the analysis of symmetry, we find that the spin splitting feature related to the Ut, PTt, MzUt, or MzPTt symmetries in altermagnet multilayers. In addition, we find that the stacking engineering can effectively realize the transform from antiferromagnetism to altermagnetism and semiconductor to metal for the Jauns bilayer V2SeTeO. More interestingly, the strain not only induces an intriguing multipiezo effect, encompassing the piezovalley, piezomagnetism and piezoelectric, but also achieves the abundant topological phase. Our findings offer a generalized direction for manipulating the spin splitting, valley polarization, and topological states, promoting practical application of valleytronic and spintronic devices based on two-dimensional altermagnets.