论文标题
声子介导的二维跨界
Phonon-mediated dimensional crossover in bilayer CrI3
论文作者
论文摘要
在双层CRI3中，实验和理论研究表明，磁顺序与层均匀构型密切相关。在这项工作中，我们研究了在双层系统的磁性下，由非线性声子耦合引起的动态晶格失真的效果。我们使用密度函数理论来确定声子特性和群体理论来获得允许的声子 - 子声音相互作用。我们发现，双层结构具有低频拉曼模式，在合适的红外声子模式的相干光启动上可以非线性激活。反过来，这种瞬态晶格修饰会扭转实验中可访问的参数的层间旋转相互作用的符号，表明低频光诱导的抗fiferromagnet to-ferromagnet转变。
In bilayer CrI3, experimental and theoretical studies suggest that the magnetic order is closely related to the layer staking configuration. In this work, we study the effect of dynamical lattice distortions, induced by non-linear phonon coupling, in the magnetic order of the bilayer system. We use density functional theory to determine the phonon properties and group theory to obtain the allowed phonon-phonon interactions. We find that the bilayer structure possesses low-frequency Raman modes that can be non-linearly activated upon the coherent photo-excitation of a suitable infrared phonon mode. This transient lattice modification, in turn, inverts the sign of the interlayer spin interaction for parameters accessible in experiments, indicating a low-frequency light-induced antiferromagnet-to-ferromagnet transition.
