Xue Hai-Bin, Jiao Hu-Jun, Liang Jiu-Qing, Liu Wu-Ming
College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China.
Department of Physics, Shanxi University, Taiyuan 030006, China.
Sci Rep. 2015 Mar 10;5:8978. doi: 10.1038/srep08978.
Full counting statistics of electron transport is a powerful diagnostic tool for probing the nature of quantum transport beyond what is obtainable from the average current or conductance measurement alone. In particular, the non-Markovian dynamics of quantum dot molecule plays an important role in the nonequilibrium electron tunneling processes. It is thus necessary to understand the non-Markovian full counting statistics in a quantum dot molecule. Here we study the non-Markovian full counting statistics in two typical quantum dot molecules, namely, serially coupled and side-coupled double quantum dots with high quantum coherence in a certain parameter regime. We demonstrate that the non-Markovian effect manifests itself through the quantum coherence of the quantum dot molecule system, and has a significant impact on the full counting statistics in the high quantum-coherent quantum dot molecule system, which depends on the coupling of the quantum dot molecule system with the source and drain electrodes. The results indicated that the influence of the non-Markovian effect on the full counting statistics of electron transport, which should be considered in a high quantum-coherent quantum dot molecule system, can provide a better understanding of electron transport through quantum dot molecules.
电子输运的全计数统计是一种强大的诊断工具，用于探究量子输运的本质，这是仅凭平均电流或电导测量无法实现的。特别是，量子点分子的非马尔可夫动力学在非平衡电子隧穿过程中起着重要作用。因此，有必要了解量子点分子中的非马尔可夫全计数统计。在这里，我们研究了两种典型量子点分子中的非马尔可夫全计数统计，即在特定参数范围内具有高量子相干性的串联耦合和侧耦合双量子点。我们证明，非马尔可夫效应通过量子点分子系统的量子相干表现出来，并且对高量子相干量子点分子系统中的全计数统计有显著影响，这取决于量子点分子系统与源电极和漏电极的耦合。结果表明，非马尔可夫效应在高量子相干量子点分子系统中对电子输运全计数统计的影响，有助于更好地理解通过量子点分子的电子输运。
