Three-dimensional electronic spectroscopy of excitons in GaAs quantum wells.
Three-dimensional electronic spectroscopy of excitons in GaAs quantum wells.
复制标题
GaAs 量子阱中激子的三维电子能谱。
DOI：
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发表时间：
2009
影响因子：
4.4
通讯作者：
K. Nelson
中科院分区：
文献类型：
--
作者：
Daniel B. Turner;K. Stone;K. Gundogdu;K. Nelson
我们演示了三维（3D）电子傅里叶变换光谱的GaAs量子威尔斯使用四个完全相位相干，非共线光场。由于完整的复信号场被测量为所有三个时间间隔的函数，因此所得3D光谱固体中的几乎每个峰都来自由单个费曼路径表示的可区分的跃迁序列。我们使用的3D光谱峰分离的两个途径，涉及弱结合的混合双激子在不同的时间顺序产生。在这个过程中，我们揭示了一个峰，以前被掩盖的相关，但未绑定的激子对相干。我们还演示了一个校准程序的载波频率，产生双激子结合能值具有高精度。
We demonstrate three-dimensional (3D) electronic Fourier transform spectroscopy of GaAs quantum wells using four fully phase-coherent, noncollinear optical fields. Since the full complex signal field is measured as a function of all three time intervals, nearly every peak in the resulting 3D spectral solid arises from a distinguishable sequence of transitions represented by a single Feynman pathway. We use the 3D spectral peaks to separate two pathways involving weakly bound mixed biexcitons generated in different time orders. In the process, we reveal a peak that was previously obscured by a correlated but unbound exciton pair coherence. We also demonstrate a calibration procedure for the carrier frequency which yields biexciton binding energy values with high accuracy.