Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots
Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots
复制标题
量子点中自旋锁模与核诱导频率聚焦的相互作用
DOI：
10.1103/physrevb.102.115301
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发表时间：
2020
影响因子：
3.7
通讯作者：
G. Uhrig
中科院分区：
文献类型：
--
作者：
P. Schering;Philipp W. Scherer;G. Uhrig
我们研究了核诱导频率对受到周期性光脉冲序列影响的量子点自旋相干锁模的影响。特别是，我们解决了核引起的频率聚焦是否总是增强自旋锁模效果的问题。我们结合了两种先进的半经典方法，并通过包含光激发三重子态的完整动力学来扩展所得模型。为了减少与完整量子模型的差异，我们通过将每个泵浦脉冲解释为测量来建立非确定性脉冲描述。这两种扩展都会导致物理学的重大质变。它们的结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，即核旋转浴的非零平均极化的形成，导致相干时间一定的增加。
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 non-deterministic 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 non-zero average polarization of the nuclear spin bath, leading to a certain increase of the coherence time.
影响因子：
8.6
作者：
Faribault, Alexandre;Schuricht, Dirk
通讯作者：
Schuricht, Dirk