GENERATION MECHANISM FOR COHERENT LO PHONONS IN SURFACE-SPACE-CHARGE FIELDS OF III-V-COMPOUNDS
GENERATION MECHANISM FOR COHERENT LO PHONONS IN SURFACE-SPACE-CHARGE FIELDS OF III-V-COMPOUNDS
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DOI：
10.1007/bf00348337
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发表时间：
1992-11-01
影响因子：
2.7
通讯作者：
KURZ, H
中科院分区：
文献类型：
--
作者：
PFEIFER, T;DEKORSY, T;KURZ, H
我们报告的细节的相干LO声子产生的表面空间电荷区域的III-V族化合物的自由载流子的光注入与激光脉冲的持续时间为50 fs，在2 eV。瞬态表面场的动力学，以及相干晶格振动，测量通过电光采样技术在不同的实验条件下。相干声子振动的驱动力是由于光激发自由载流子对本征表面电场的超快屏蔽而引起的晶格的突然去极化。
We report on details of coherent LO phonon generation in surface-space-charge regions of III-V-compounds by optical injection of free carriers with laser pulses of 50 fs duration at 2 eV. Both the dynamics of the transient surface field, as well as the coherent lattice vibration, are measured via electro-optic sampling techniques under different experimental conditions. The driving force for the coherent phonon vibration is the sudden depolarization of the crystal lattice due to ultrafast screening of the intrinsic electrical surface field by photoexcited free carriers.