论文标题
单层CRI $ _3 $中自旋旋转相互作用的应变和电场控制
Strain and electric-field control of spin-spin interactions in monolayer CrI$_3$
论文作者
论文摘要
我们使用密度功能理论研究了机械菌株和垂直电场对二维单层CRI $ _3 $的电子和磁性地面特性的影响。我们提出了一种最小的自旋模型哈密顿量，由对称的各向同性交换相互作用，磁各向异性能和dzyaloshinskii-moriya（DM）相互作用组成，以捕获系统的最相关磁性。我们计算各种自旋旋转相互作用的机械应变和电场依赖性。我们的结果表明，交换相互作用的幅度和迹象都可以通过应变来设计，而电场仅影响其幅度。但是，应变和电场影响DM矢量的方向和振幅。磁各向异性能量的振幅也可以通过施加的应变实质性地改变。我们表明，与电场相比，应变可以更有效地用于操纵系统的磁性和电子特性。值得注意的是，这种旋转相互作用的系统调整对于室温旋转纳米版的工程至关重要。
We investigate the impact of mechanical strains and a perpendicular electric field on the electronic and magnetic ground-state properties of two-dimensional monolayer CrI$_3$ using density functional theory. We propose a minimal spin model Hamiltonian, consisting of symmetric isotropic exchange interactions, magnetic anisotropy energy, and Dzyaloshinskii-Moriya (DM) interactions, to capture most pertinent magnetic properties of the system. We compute the mechanical strain and electric field dependence of various spin-spin interactions. Our results show that both the amplitudes and signs of the exchange interactions can be engineered by means of strain, while the electric field affects only their amplitudes. However, strain and electric fields affect both the directions and amplitudes of the DM vectors. The amplitude of the magnetic anisotropy energy can also be substantially modified by an applied strain. We show that in comparison with an electric field, strain can be more efficiently used to manipulate the magnetic and electronic properties of the system. Notably, such systematic tuning of the spin interactions is essential for the engineering of room-temperature spintronic nanodevices.
