Department of Physics, Tokyo Institute of Technology, Oh-Okayama 2-12-1, Tokyo 152-8551, Japan.
National Institute of Information and Communications Technology, 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan.
Phys Rev Lett. 2014 Apr 11;112(14):147404. doi: 10.1103/PhysRevLett.112.147404.
We have observed a time-correlated frequency fluctuation in non-Markovian dephasing of excitons in InAs quantum dots using a six-wave mixing technique. In this measurement, the arrival times of the excitation pulses were controlled to eliminate the influence of Markovian dephasing and to measure the pure non-Markovian behavior. The experimental result shows that the time correlation of the frequency fluctuation due to exciton-phonon interactions was maintained in the quantum dots for over 10 ps. This long-time correlation is caused by the modification of the phonon coupling distribution.
我们使用六波混频技术观察到了在非马尔可夫退相过程中，在砷化铟量子点中激子的与时间相关的频率涨落。在这项测量中，我们控制激发脉冲的到达时间，以消除马尔可夫退相的影响并测量纯粹的非马尔可夫行为。实验结果表明，由于激子-声子相互作用导致的频率涨落的时间相关性在量子点中保持了超过 10 皮秒。这种长时间的相关性是由声子耦合分布的改变引起的。
