论文标题
平面外部外观应变调整内层和层间磁耦合在CRSE2和CRTE2单层和双层中
In-plane epitaxy strain tuning intralayer and interlayer magnetic couplings in CrSe2 and CrTe2 mono- and bi-layers
论文作者
论文摘要
在范德 - 瓦尔人外延界面上的不匹配的晶格 - 常见的晶状体通常会在外延层的晶格中引入平面菌株，称为外延 - 固定，其中菌株不遵循层内poisson的关系。在这里，我们介绍了使用密度功能理论计算预测的，在外观稳定中介绍了8％的外观固定下的CRSE2和CRTE2单层和双层的磁相图。他们表明，面内外延策略会操纵它们的内部或间层磁性。平面应变通过层间泊松比定义的层间距离变化，该比例根据面内磁性，以两种相反的方式控制层间磁性。层内磁性的可调性是竞争层内CR-CR超级交换相互作用的结果。引入了石墨烯基板以检查我们图表的有效性。我们的工作还为在外部稳定中有争议的CRSE2和CRTE2外延单层或Bi-layers中有争议的磁性提供了初步的解释。
Mismatched lattice-constants at a van-der-Waals epitaxy interface often introduce in-plane strains to the lattice of the epitaxial layer, termed epitaxy-strain, where the strains do not follow the intra-layer Poisson's relation. Here, we presented the magnetic phase diagrams of the CrSe2 and CrTe2 mono- and bi-layers under epitaxy-strain up to 8 %, as predicted using density-functional-theory calculations. They show that the in-plane epitaxy-strain manipulates either the intra- or inter-layer magnetism of them. The in-plane strain varies the interlayer distance, defined using an inter-layer Poisson's ratio, which governs the inter-layer magnetism in two opposite ways depending on the in-plane magnetism. The tunability of the intra-layer magnetism is a result of competing intra-layer Cr-Cr super-exchange interactions. A graphene substrate was introduced to examine the validity of our diagrams in practice. Our work also gives a tentative explanation on the controversially reported magnetizations in CrSe2 and CrTe2 epitaxial mono- or bi-layers under epitaxy-strains.
