论文标题
旋转刚度，光谱重量和金属螺旋磁铁中强元的landau阻尼
Spin stiffness, spectral weight, and Landau damping of magnons in metallic spiral magnets
论文作者
论文摘要
我们分析具有螺旋磁性的金属电子系统中镁质的性能。我们的分析基于在两个或三个维度上与局部哈伯德相互作用的紧密结合电子的敏感性的随机近似。我们从易感性中的极点识别三个磁通分支，一个与面板相关，其他两个与螺旋顺序参数的平面外波动有关。我们得出了旋转刚度和磁化模式的光谱重量的一般表达式，也可以从中获得镁速度。此外，我们确定由于兰道阻尼而导致的镁衰减速率的大小。虽然平面模式的衰减速率是其激发能量的顺序，但平面外模式的衰减速率较小，因此即使存在Landau阻尼，这些模式也是渐近稳定的激发。
We analyze the properties of magnons in metallic electron systems with spiral magnetic order. Our analysis is based on the random phase approximation for the susceptibilities of tight binding electrons with a local Hubbard interaction in two or three dimensions. We identify three magnon branches from poles in the susceptibilities, one associated with in-plane, the other two associated with out-of-plane fluctuations of the spiral order parameter. We derive general expressions for the spin stiffnesses and the spectral weights of the magnon modes, from which also the magnon velocities can be obtained. Moreover, we determine the size of the decay rates of the magnons due to Landau damping. While the decay rate of the in-plane mode is of the order of its excitation energy, the decay rate of the out-of-plane mode is smaller so that these modes are asymptotically stable excitations even in the presence of Landau damping.
