论文标题
三角形三重量子点的相干时间依赖性振荡和时间相关性
Coherent time-dependent oscillations and temporal correlations in triangular triple quantum dots
论文作者
论文摘要
到目前为止,三重量子点(TQD)的波动行为主要集中在长期限制的当前累积量,这是通过完整的计数统计数据的。鉴于(TQD)是具有许多有趣特征的非平凡开放量子系统,例如Aharonov-Bohm干扰和连贯的种群阻滞,新的波动时间统计数据,例如等待时间分布(WTD),可能会提供更多的信息,而不是仅仅提供当前累积的信息。在本文中,我们使用Born-Markov主方程来计算以几种运输方式以三角形环几何形状在三角形环几何形状中的相干耦合的TQD的标准和高阶WTD。在所有情况下,我们都会发现WTD显示直接对应于个体时间依赖的点占用概率的相干振荡,结果最近在参考文献[1]中也报告了这一结果。但是,我们的分析超出了单个占用率和单一等待时间状态,研究了多个电子占据的TQD的等待时间行为以及有限的电子电子相互作用。我们证明,在这些较高占用率的方案中,量子相干效应引入了连续的等待时间之间的相关性,我们可以通过施加的磁场进行调整。我们还表明,相关性可用于区分具有相同FC的TQD配置,并且可以用Aharonov-Bohm干扰来调整黑暗状态,从而比单占用率更复杂。
The fluctuation behavior of triple quantum dots (TQDs) has, so far, largely focused on current cumulants in the long-time limit via full counting statistics. Given that (TQDs) are non-trivial open quantum systems with many interesting features, such as Aharonov-Bohm interference and coherent population blocking, new fluctuating-time statistics, such as the waiting time distribution (WTD), may provide more information than just the current cumulants alone. In this paper, we use a Born-Markov master equation to calculate the standard and higher-order WTDs for coherentlycoupled TQDs arrayed in triangular ring geometries for several transport regimes. In all cases we find that the WTD displays coherent oscillations that correspond directly to individual time-dependent dot occupation probabilities, a result also reported recently in Ref.[1]. Our analysis, however, goes beyond the single-occupancy and single waiting time regimes, investigating waiting time behavior for TQDs occupied by multiple electrons and with finite electron-electron interactions. We demonstrate that, in these regimes of higher occupancy, quantum coherent effects introduce correlations between successive waiting times, which we can tune via an applied magnetic field. We also show that correlations can be used to distinguish between TQD configurations that have identical FCS and that dark states can be tuned with Aharonov-Bohm interference for more complicated regimes than single-occupancy.