论文标题
\ textit {ab intib}研究巡回kagome磁铁FESN的自旋波动的研究
\textit{Ab initio} study on spin fluctuations of itinerant kagome magnet FeSn
论文作者
论文摘要
Kagome抗铁磁金属FESN已成为探索新型电子状态的吸引平台，例如拓扑狄拉克状态和通过局部电子形成平坦的频段。除了电子特性之外，还通过将简化的海森堡模型应用于kagome磁系统。对FESN的In弹性中子散射研究发现，发现低能的镁分散剂，但是高能在高能量处的木剂分散剂进行了强烈涂抹，无法通过本地化的自旋模型来解释，但在高能量处的木剂分散剂都无法解释。在本文中，我们利用线性旋转波理论和时间依赖性密度函数扰动理论来研究FESN的自旋波动。通过比较计算出的自旋波光谱和stoner Continuum，我们明确表明，高能在高能下的阻尼是由于Landau阻尼引起的，并且在M和K点上的高能光学杂种类似于M and K点的分支是由这些地区相对较低的Stoner激发引起的。
Kagome antiferromagnetic metal FeSn has become an attracting platform for the exploration of novel electronic states, such as topological Dirac states and the formation of flat bands by localized electrons. Apart from the electronic properties, Dirac magnons and flat magnon bands have also been proposed by applying simplified Heisenberg models to kagome magnetic systems.Inelastic neutron scattering studies on FeSn found well defined magnon dispersions at low energies,but magnons at high energies are strongly dampled, which can not be explained by localized spin models. In this paper, we utilize both linear spin wave theory and time-dependent density functional perturbation theory to investigate spin fluctuations of FeSn. Through the comparison of calculated spin wave spectra and Stoner continuum, we explicitly show that the damping of magnons at high energies are due to the Landau damping, and the appearance of high energy optical-magnon like branches at the M and K point are resulted by relatively low Stoner excitation intensity at those regions.
