Coherent A1g and Eg phonons of antimony
Coherent A1g and Eg phonons of antimony
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DOI：
10.1063/1.2940130
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发表时间：
2008-06
影响因子：
3.2
通讯作者：
K. Ishioka;M. Kitajima;O. Misochko
中科院分区：
文献类型：
--
作者：
K. Ishioka;M. Kitajima;O. Misochko
我们报告了锑的相干 A1g 和 Eg 声子的超快动力学随温度和光学偏振的变化。与铋一样，两种声子模式在初始相位中表现出接近 π/2 的差异，表明它们与光激发电子的耦合强度不同。声子振幅对光学偏振和温度的依赖性表明相干 A1g 声子是通过位移和拉曼过程产生的，而不是纯粹的位移过程。相比之下，相干 Eg 声子的产生可以仅在拉曼框架内理解。
We report the ultrafast dynamics of the coherent A1g and Eg phonons of antimony as a function of temperature and optical polarization. Like in bismuth, the two phonon modes exhibit nearly π/2 difference in their initial phase, suggesting their different coupling strengths with photoexcited electrons. The dependence of the phonon amplitude on the optical polarization and temperature indicates the generation of the coherent A1g phonons through both displacive and Raman processes, rather than a purely displacive one. In contrast, the generation of the coherent Eg phonons can be understood within Raman framework alone.