论文标题
ZNSE/Bete量子井中激子的光学第二和第三次谐波生成
Optical second and third harmonic generation on excitons in ZnSe/BeTe quantum wells
论文作者
论文摘要
具有II型带对齐方式的ZnSE/Bete量子孔中发现了激子上的光学谐波生成。通过第二和第三次谐波生成（SHG和THG），将两种实验性方法用于频谱飞秒激光脉冲和频谱narrow picsecond脉冲。 SHG信号是对称性的，用于沿结构的生长轴的光传播，即[001]晶体轴，但可以由外部磁场诱导。在零磁场上检测到THG信号，其强度独立于场。 SHG和THG旋转各向异性图的小组理论分析使我们能够识别涉及的激发机制。
Optical harmonic generation on excitons is found in ZnSe/BeTe quantum wells with type-II band alignment. Two experimental approaches with spectrally-broad femtosecond laser pulses and spectrally-narrow picosecond pulses are used for spectroscopic studies by means of second and third harmonic generation (SHG and THG). The SHG signal is symmetry-forbidden for light propagation along the structure's growth axis, which is the [001] crystal axis, but can be induced by an external magnetic field. The THG signal is detected at zero magnetic field and its intensity is field independent. A group theory analysis of SHG and THG rotational anisotropy diagrams allows us to identify the involved excitation mechanisms.
