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Two-color femtosecond strobe lighting of coherent acoustic phonons emitted by quantum dots

机译:量子点发出的相干声子的双色飞秒频闪照明

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摘要

The transient acoustic pulse emitted by a single InAs quantum dots layer was measured depending on the pump wavelength. By tuning the pump wavelength through the transition energies of the GaAs barrier, the wetting layer and the quantum dots themselves, the acoustic phonon emission is shown to be strongly correlated to the electronic structure of the quantum dots layer system. The contributions of the wetting layer and the quantum dots to the acoustic signal were clearly identified and quantified by comparing different regions of the same sample containing or not quantum dots.
机译:由单个InAs量子点层发射的瞬态声脉冲根据泵浦波长进行测量。通过利用GaAs势垒,润湿层和量子点本身的跃迁能来调节泵浦波长,声子的声子发射与量子点层系统的电子结构密切相关。通过比较包含或不包含量子点的同一样品的不同区域,可以清楚地识别和量化润湿层和量子点对声信号的贡献。

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