碳化硅中区域折叠声学声子的阿秒分辨相干控制
Attosecond-resolved coherent control of zone-folded acoustic phonons in silicon carbide
AI总结：
本文利用飞秒脉冲相干激发4H-SiC中6 THz区域折叠声学声子，以300阿秒精度实现振幅相干控制，并通过双能级脉冲受激拉曼模型给出非共振条件下的解析控制方案。
摘要：
利用飞秒近红外脉冲相干激发了4H碳化硅（SiC）中的区域折叠声学声子（6 THz），并通过泵浦-探测方案的瞬态反射率进行测量。其振幅以300阿秒的精度实现相干控制，结果显示由电子与声子干涉产生的干涉条纹图样。采用包含两个电子与声子能级以及脉冲受激拉曼过程的模型计算，很好地再现了实验结果。利用该模型，我们得到了非共振条件下相干控制方案的解析形式。
英文摘要：
Zone-folded acoustic phonons (6 THz) in 4H silicon carbide (SiC) have been coherently excited using a femtosecond near-infrared pulse and measured through transient reflectivity with a pump and probe protocol. Their amplitude is coherently controlled with 300-attoseconds precision and the results show interference fringe patterns due to electronic and phonon interference. The results are well reproduced by a model calculation with two electronic and phonon levels and an impulsive stimulated Raman process. Using the model, we obtain the analytical form of the coherent control scheme at an off-resonant condition.
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