Coherent phonons in condensed media
Coherent phonons in condensed media
复制标题
凝聚介质中的相干声子
DOI：
10.1007/bfb0084242
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发表时间：
2000
影响因子：
1.9
通讯作者：
H. Kurz
中科院分区：
文献类型：
--
作者：
T. Dekorsy;G. Cho;H. Kurz
相干声子和声子极化子的脉冲激发和相敏探测提供了对物质动力学特性的详细洞察。实验是基于飞秒时间分辨率的光泵浦探测技术。这些技术可以同时检测相干晶格运动的幅度和相位。可以高精度地获得太赫兹范围内的频率和皮秒范围内的减相时间。特别是在半导体和半导体异质结构中，相干声子模式和自由载流子同时被激发，获得了远离平衡的载流子-声子相互作用的重要信息。本章概述了凝聚态物理这一活跃领域的最新成就。
The impulsive excitation and phase-sensitive detection of coherent phonons and phonon-polaritons provide a detailed insight into the dynamical properties of matter. The experiments are based on optical pump-probe techniques with femtosecond time resolution. These techniques enable the detection of amplitude and phase of the coherent lattice motion simultaneously. Frequencies in the terahertz range and dephasing times in the picosecond range can be obtained with high accuracy. Especially in semiconductors and semiconductor heterostructures, where a coherent phonon mode and free carriers are excited simultaneously, important information about carrier-phonon interaction far away from equilibrium is obtained. This chapter presents an overview of recent achievements in this lively field of condensedmatter physics.