论文标题
相干镁的总和激发
Sum-frequency excitation of coherent magnons
论文作者
论文摘要
通常，通过拉曼散射过程实现了镁的相干激发，其中驱动场的差异成分与磁通能共鸣。在这里，我们描述了驱动场的总频率成分通过两粒子吸收过程相干激发镁的机制。我们使用landau-lifshitz-gilbert形式主义来比较自旋细分振幅，即不同类型的冲动性刺激性刺激和离子拉曼散射过程及其总和频率对应物在反铁磁模型系统中诱导。我们表明，线性极化驱动场启用的总和频率机制产生的激发效率比已建立的拉曼技术可比或更大，而椭圆极化仅产生弱和循环极化的根本没有频率频率分量。这里提出的机制通过拉曼型过程完成了动态自旋控制的地图。
Coherent excitation of magnons is conventionally achieved through Raman scattering processes, in which the difference-frequency components of the driving field are resonant with the magnon energy. Here, we describe mechanisms by which the sum-frequency components of the driving field can be used to coherently excite magnons through two-particle absorption processes. We use the Landau-Lifshitz-Gilbert formalism to compare the spin-precession amplitudes that different types of impulsive stimulated and ionic Raman scattering processes and their sum-frequency counterparts induce in an antiferromagnetic model system. We show that sum-frequency mechanisms enabled by linearly polarized driving fields yield excitation efficiencies comparable or larger than established Raman techniques, while elliptical polarizations produce only weak and circularly polarizations no sum-frequency components at all. The mechanisms presented here complete the map for dynamical spin control by the means of Raman-type processes.
