论文标题
重新访问相干声子检测中探针信号的调节：分析和第一原理计算分析
Modulation of probe signal in coherent phonon detection revisited: Analytical and first-principles computational analyses
论文作者
论文摘要
在理论上以钻石为例，研究了介电声子对介电声子的泵探针测量值的调节。分析研究以及基于时间依赖性密度功能理论的第一原理计算用于阐明探针信号调节的机制。边界和大量效应是系统地研究的，重点是调制和相干声音的原子运动之间的相位关系。将它们汇总如下：边界效应的调制与相干的声子幅度相相，而散装效应显示$π/2 $相位差。强频率依赖性出现在调制中，通过大量效应，而边界效应没有频率依赖性。第一原理计算支持分析结果的可靠性。
Modulation of probe signal in pump-probe measurements of coherent phonons in dielectrics, with and without spectral resolution, are investigated theoretically taking diamond as an example. Analytical investigation as well as first-principles calculations based on time-dependent density functional theory is utilized to clarify the mechanism of the modulation of the probe signals. Boundary and bulk effects are investigated systematically, putting emphasis on the phase relation between the modulation and the atomic motion of the coherent phonon. They are summarized as follows: Modulation by the boundary effect is in phase with the coherent phonon amplitude, while that by the bulk effect shows $π/2$ phase difference. Strong frequency dependence appears in the modulation by the bulk effect, while no frequency dependence by the boundary effect. First-principles calculations support the reliability of the analytical result.
