Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots
Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots
复制标题
DOI：
10.1103/physrevb.72.035306
复制
发表时间：
2004-04
影响因子：
3.7
通讯作者：
Q. Q. Wang-Q.;A. Muller;P. Bianucci;E. Rossi;Q. Xue;T. Takagahara;C. Piermarocchi;A. Macdonald;
中科院分区：
文献类型：
--
作者：
Q. Q. Wang-Q.;A. Muller;P. Bianucci;E. Rossi;Q. Xue;T. Takagahara;C. Piermarocchi;A. Macdonald;
利用光致发光光谱，我们研究了自组装量子点中激子量子位的光学操纵过程中拉比振荡阻尼的性质。通过在 4 ps 和 10 ps 之间改变固定脉冲持续时间的脉冲幅度来记录拉比振荡。多达五个周期可见，使得量化激励相关阻尼成为可能。我们发现这种阻尼对于较短的脉冲宽度更为明显，并表明其起源是润湿层中载流子的非共振激发，最有可能涉及束缚到连续和连续到束缚的跃迁。
Using photoluminescence spectroscopy, we have investigated the nature of Rabi oscillation damping during optical manipulation of excitonic qubits in self-assembled quantum dots. Rabi oscillations were recorded by varying the pulse amplitude for fixed pulse durations between 4 ps and 10 ps. Up to five periods are visible, making it possible to quantify the excitation dependent damping. We find that this damping is more pronounced for shorter pulse widths and show that its origin is the nonresonant excitation of carriers in the wetting layer, most likely involving bound-to-continuum and continuum-to-bound transitions.