论文标题
第一原理计算，用于激光兴奋的磁性材料的瞬时吸收
First-principles calculations for transient absorption of laser-excited magnetic materials
论文作者
论文摘要
我们使用有限的电子温度下的时间依赖性密度函数理论研究了激光激光散装钴和镍的光学性质的修饰。由于第一原理模拟，在$ M_ {2,3} $吸收边缘周围观察到磁性材料的光吸收的复杂变化。 Based on the microscopic analysis, we clarify that this complex absorption change consists of the two following components: (i) the decrease in the photoabsorption in a narrow energy range around the $M_{2,3}$ edge, which reflects the blue shift of the absorption edge due to the light-induced demagnetization, and (ii) the increase in the photoabsorption in a wider range around the $M_{2,3}$边缘，这反映了由于光诱导的电子定位而导致的局部场效应的修饰。瞬态光学特性和磁性性能之间的关系可以通过瞬态吸收光谱法在磁性材料中监测超快（DE）磁化的方法。
We investigate the modification in the optical properties of laser-excited bulk cobalt and nickel using the time-dependent density functional theory at a finite electron temperature. As a result of the first-principles simulation, a complex change in the photoabsorption of the magnetic materials is observed around the $M_{2,3}$ absorption edge. Based on the microscopic analysis, we clarify that this complex absorption change consists of the two following components: (i) the decrease in the photoabsorption in a narrow energy range around the $M_{2,3}$ edge, which reflects the blue shift of the absorption edge due to the light-induced demagnetization, and (ii) the increase in the photoabsorption in a wider range around the $M_{2,3}$ edge, which reflects the modification in the local-field effect due to the light-induced electron localization. The relation between the transient optical and magnetic properties may open a way to monitor ultrafast (de)magnetization and spin dynamics in magnetic materials via transient absorption spectroscopy.
