Affiliation:
1. School of Electronic Engineering, Xi'an University of Posts and Telecommunications 1 , Xi'an 710121, China
2. Science, Mathematics and Technology (SMT), Singapore University of Technology and Design (SUTD) 2 , 8 Somapah Road, Singapore 487372
Abstract
Altermagnetism can achieve spin-split bands in collinear symmetry-compensated antiferromagnets. Here, we predict altermagnetic order in Janus monolayer Cr2SO with eliminated inversion symmetry, which can realize the combination of piezoelectricity and altermagnetism in a two-dimensional (2D) material, namely, 2D piezoelectric altermagnetism. It is found that Cr2SO is an altermagnetic semiconductor, and the spin-split bands of both valence and conduction bands are near the Fermi level. The Cr2SO has large out-of-plane piezoelectricity (|d31| = 0.97 pm/V), which is highly desirable for ultrathin piezoelectric device application. Due to spin-valley locking, both spin and valley can be polarized by simply breaking the corresponding crystal symmetry with uniaxial strain. Our findings provide a platform to integrate spin, piezoelectricity, and valley in a single material, which is useful for multi-functional device applications.
Funder
Natural Science Basic Research Program of Shaanxi Province
Singapore Ministry of Education (MOE) Academic Research Fund
Subject
Physics and Astronomy (miscellaneous)
Cited by
3 articles.
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