论文标题
射频应力引起的CDTE/ZNTE量子点的调制
Radio-frequency stress-induced modulation of CdTe/ZnTe quantum dots
论文作者
论文摘要
我们通过表面声波（SAWS）展示了单个CDTE/Znte量子点（QD）的能量的射频调整。尽管Znte的压电系数非常弱，但GHz范围内的锯仍可以在Znte表面发射，并使用沉积在含有CDTE QD的Znte Znte上的c轴为导向的ZnO层上发射。单个QD的光致发光（PL）用作声学应变场的纳米尺度传感器。 QD的能量通过GHz范围内的SAW调节，并导致时间融合的PL光谱的特征扩展。还可以使用相锁定的时域光谱在时域中检测到QD PL能量的动态调制。该技术特别用于监测由两个或更多锯脉冲在空腔中叠加的复杂局部声场。在磁场下，单个QD对单个QD的动态光谱调整可用于生成具有在GHz范围内控制的交替圆极化的单个光子。
We demonstrate radio-frequency tuning of the energy of individual CdTe/ZnTe quantum dots (QDs) by Surface Acoustic Waves (SAWs). Despite the very weak piezoelectric coefficient of ZnTe, SAW in the GHz range can be launched on a ZnTe surface using interdigitated transducers deposited on a c-axis oriented ZnO layer grown on ZnTe containing CdTe QDs. The photoluminescence (PL) of individual QDs is used as a nanometer-scale sensor of the acoustic strain field. The energy of QDs is modulated by SAW in the GHz range and leads to characteristic broadening of time-integrated PL spectra. The dynamic modulation of the QD PL energy can also be detected in the time domain using phase-locked time domain spectroscopy. This technique is in particular used for monitoring complex local acoustic fields resulting from the superposition of two or more SAW pulses in a cavity. Under magnetic field, the dynamic spectral tuning of a single QD by SAW can be used to generate single photons with alternating circular polarization controlled in the GHz range.
