Coherent nonlinear optical response of single quantum dots studied by ultrafast near-field spectroscopy.
Coherent nonlinear optical response of single quantum dots studied by ultrafast near-field spectroscopy.
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DOI：
10.1103/physrevlett.89.057401
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发表时间：
2002-07
影响因子：
8.6
通讯作者：
T. Guenther;C. Lienau;T. Elsaesser;M. Glanemann;V. M. Axt;T. Kuhn;S. Eshlaghi;A. Wieck
中科院分区：
文献类型：
--
作者：
T. Guenther;C. Lienau;T. Elsaesser;M. Glanemann;V. M. Axt;T. Kuhn;S. Eshlaghi;A. Wieck
在飞秒近场泵浦探测实验中研究了GaAs单量子点的非线性响应。在负的时间延迟，瞬态反射率光谱显示出明显的振荡结构周围的量子点激子线，提供了第一个证据的激子极化的扰动自由感应衰减。激子极化和连续激发之间的相位扰动库仑相互作用主导了超快时间尺度上的光学非线性。基于半导体布洛赫方程的理论分析说明了这种行为。
The nonlinear response of single GaAs quantum dots is studied in femtosecond near-field pump-probe experiments. At negative time delays, transient reflectivity spectra show pronounced oscillatory structure around the quantum dot exciton line, providing the first evidence for a perturbed free induction decay of the excitonic polarization. Phase-disturbing Coulomb interactions between the excitonic polarization and continuum excitations dominate the optical nonlinearity on ultrafast time scales. A theoretical analysis based on the semiconductor Bloch equations accounts for this behavior.