Density-matrix theory of coherent phonon oscillations in germanium.
Density-matrix theory of coherent phonon oscillations in germanium.
复制标题
锗中相干声子振荡的密度矩阵理论。
DOI：
10.1103/physrevb.47.16229
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Kurz
中科院分区：
文献类型：
--
作者：
Scholz;Pfeifer;Kurz
用扩展的密度矩阵模型描述了锗中相干声子振荡的产生和探测过程。在声子振荡产生的相关运动方程层次中，识别出与带间偶极子矩阵元素各向异性相关的空穴分布的各向异性是相干振动的驱动力。反射率相干声子的光学探测是基于相干位移引起的各向异性带隙调制，并与价带的变形势加权
The generation and detection processes of coherent phonon oscillations in germanium are described within an extended density-matrix model. In the relevant hierarchy of equations of motion for the generation of the phonon oscillation, the anisotropy of the hole distributions related to the anisotropy of the interband dipole matrix elements is identified as the driving force of the coherent vibration. The optical detection of coherent phonons in reflectivity is based on anisotropic band-gap modulations due to the coherent displacements, weighted with the deformation potential of the valence bands