Coherent THz phonons driven by light pulses and the Sb problem: What is the mechanism?
Coherent THz phonons driven by light pulses and the Sb problem: What is the mechanism?
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DOI：
10.1103/physrevlett.77.3661
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发表时间：
1996-10-21
影响因子：
8.6
通讯作者：
Merlin, R
中科院分区：
文献类型：
--
作者：
Garrett, GA;Albrecht, TF;Merlin, R
飞秒激光脉冲在大约 3.4 THz 的 Sb 相干 E(g) 声子中产生，除了 Al 的振荡之外，对称性由唯象位移激发模型解释。实验与理论计算一致，表明吸收材料（如锑）的相干驱动力是由拉曼过程决定的，就像在透明介质中一样。拉曼形式主义提供了一种统一的方法来描述光引起的具有脉冲和位移特征的原子运动。
Femtosecond laser pulses generate in Sb coherent E(g) phonons at approximate to 3.4 THz, in addition to oscillations of Al, symmetry accounted for by the phenomenological displacive-excitation model. Experiments agree with theoretical calculations showing that the coherent driving force in absorbing materials like Sb is determined by Raman processes, as in transparent media. The Raman formalism provides a unifying approach for describing light-induced motion of atoms of both impulsive and displacive character.