We present studies of quantum interference in a noise power spectrum in the system of two quantum dots (2QD) in a T-geometry. Performing the spectral decomposition we are able to separate local currents and distinguish between the intra- and inter-level current correlation contributions to the noise power spectrum. In particular, we analysed the large bias regime and show that for a weak coupling of 2QD with the electrodes the noise power spectrum has dips at frequencies characteristic to inter-level excitations. For a strong coupling the electron transport changes its nature and the dynamics of the current correlations is different: there are two coherently coupled relaxators with different relaxation frequencies. These two regimes of current dynamics are separated by a quantum critical point, in which the noise power spectrum shows a specific frequency dependence. In the linear response limit the noise power spectrum is related to the admittance, which shows characteristics different, due to quantum interference, for the weak and strong coupling case.

我们介绍了 T 几何中两个量子点 (2QD) 系统中噪声功率谱中的量子干涉研究。执行频谱分解，我们能够分离局部电流并区分对噪声功率谱的级内和级间电流相关性贡献。特别是，我们分析了大偏置范围，并表明对于 2QD 与电极的弱耦合，噪声功率谱在层间激发的特征频率上有下降。对于强耦合，电子传输会改变其性质，并且电流相关性的动力学不同：有两个具有不同弛豫频率的相干耦合弛豫器。这两种电流动力学状态被一个量子临界点分开，其中噪声功率谱显示出特定的频率相关性。在线性响应极限中，噪声功率谱与导纳有关，由于量子干扰，弱耦合和强耦合情况下，其表现出不同的特性。