论文标题
自旋模式锁定和核诱导的频率聚焦在量子点中的相互作用
Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots
论文作者
论文摘要
我们研究了核诱导的频率的影响，该频率专注于旋转连贯性的模式锁定在经过定期光脉冲列车的量子点中。特别是，我们解决了一个问题，核诱导的频率聚焦是否总是增强自旋模式锁定的效果。我们结合了两种先进的半经典方法，并通过包括光学激发的TRION状态的完整动力学来扩展所得模型。为了将差异减少到完整的量子模型，我们通过将每个泵脉冲作为测量方法来建立一个非确定的脉冲描述。两种扩展都会导致物理学的重大定性变化。它们的组合改进了相应实验的描述。重要的是，我们观察到动态核极化的出现，即形成核自旋浴的非零平均极化，从而导致相干时间有一定的增加。
We study the influence of nuclei-induced frequency focusing on the mode locking of spin coherence in quantum dots subjected to a periodic train of optical pulses. In particular, we address the question whether or not nuclei-induced frequency focusing always enhances the effect of spin mode locking. We combine two advanced semiclassical approaches and extend the resulting model by including the full dynamics of the optically excited trion state. In order to reduce the discrepancy to a full quantum model, we establish a nondeterministic pulse description by interpreting each pump pulse as a measurement. Both extensions lead to significant qualitative changes of the physics. Their combination improves the description of the corresponding experiments. Importantly, we observe the emergence of dynamic nuclear polarization, i.e., the formation of a nonzero average polarization of the nuclear spin bath, leading to a certain increase of the coherence time.
