论文标题
超快宽带光谱，用于量化亚剪接相干性原子位移$ wte_2 $
Ultrafast broadband optical spectroscopy for quantifying subpicometric coherent atomic displacements in $WTe_2$
论文作者
论文摘要
在这里，我们展示了如何使用时间分辨的宽带光谱法来量化符号计分辨率，通过不自由调整参数的替代模型对相干声子的振荡幅度进行振动，除非通过比较实验数据和密度数据函数理论计算来确定的整体缩放系数。 $ WTE_2 $用于基准此方法。在此半学中，响应是各向异性的，并提供了两个$ a_1 $ a_1 $ optical Phonons的光谱指纹，$ \ sim $ 8和$ \ sim $ 80 $ cm^ - $$ $$^1 $。原则上，该方法可以扩展到超快激发触发相干晶格模式的任何材料调节高能光学特性。
Here we show how time-resolved broadband optical spectroscopy can be used to quantify, with femtometer resolution, the oscillation amplitudes of coherent phonons through a displacive model without free tuning parameters, except an overall scaling factor determined by comparison between experimental data and density functional theory calculations. $WTe_2$ is used to benchmark this approach. In this semimetal, the response is anisotropic and provides the spectral fingerprints of two $A_1$ optical phonons at $\sim$8 and $\sim$80 $cm^-$$^1$. In principle, this methodology can be extended to any material in which an ultrafast excitation triggers coherent lattice modes modulating the high-energy optical properties.
