Dynamical Fano-Like Interference between Rabi Oscillations and Coherent Phonons in a Semiconductor Microcavity System.
Dynamical Fano-Like Interference between Rabi Oscillations and Coherent Phonons in a Semiconductor Microcavity System.
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DOI：
10.1103/physrevlett.115.157402
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发表时间：
2015-10
影响因子：
8.6
通讯作者：
S. Yoshino;G. Oohata;K. Mizoguchi
中科院分区：
文献类型：
--
作者：
S. Yoshino;G. Oohata;K. Mizoguchi
本文报道了CuCL半导体微腔中短寿命拉比振荡和长寿命相干声子之间的动力学干涉，这是由于两者之间的耦合引起的。利用抽运-探测技术获得的半导体微腔信号的傅里叶变换谱表明，CuCL的相干纵向光学声子的强度随着Rabi振荡强度的增加而增强，这表明相干声子是由Fröhlich相互作用的Rabi振荡驱动的。此外，随着拉比振荡频率与声子频率的交叉而减小，相干声子谱分布由峰值变为非对称结构的凹陷。连续小波变换表明，这些峰和倾角结构分别起源于Rabi振荡和相干声子之间的相长干涉和相消干涉。我们证明了在类动力学Fano干涉的基础上，用经典耦合振子模型很好地再现了与频率失谐有关的非对称谱结构。
We report on dynamical interference between short-lived Rabi oscillations and long-lived coherent phonons in CuCl semiconductor microcavities resulting from the coupling between the two oscillations. The Fourier-transformed spectra of the time-domain signals obtained from semiconductor microcavities by using a pump-probe technique show that the intensity of the coherent longitudinal optical phonon of CuCl is enhanced by increasing that of the Rabi oscillation, which indicates that the coherent phonon is driven by the Rabi oscillation through the Fröhlich interaction. Moreover, as the Rabi oscillation frequency decreases upon crossing the phonon frequency, the spectral profile of the coherent phonon changes from a peak to a dip with an asymmetric structure. The continuous wavelet transformation reveals that these peak and dip structures originate from constructive and destructive interference between Rabi oscillations and coherent phonons, respectively. We demonstrate that the asymmetric spectral structures in relation to the frequency detuning are well reproduced by using a classical coupled oscillator model on the basis of dynamical Fano-like interference.