论文标题
在两级量子系统中的双范诺共振与曲折磷酸纳米替伯苯的耦合
Double-Fano resonance in a two-level quantum system coupled to zigzag Phosphorene nanoribbon
论文作者
论文摘要
双层量子系统是揭示相干量子传输特性的好候选者。在这里，我们考虑了由于形成两级系统（TLS）与曲折磷磷烯纳米替伯（ZPNR）的边缘通道的形成而导致的量子干扰效应。使用紧密结合方法，我们首先证明了由于附近有两个空缺杂质而在散装磷酸片中形成了TLS。然后，我们表明，这种TLS可以在ZPNR中与边缘状态的准二维连续体相结合，从而导致两浸Fano型线形状的出现。为此，我们概括了Lippmann-Schwinger方法，通过两个耦合的杂质缺陷研究ZPNR中边缘电子的散射。我们获得了传输系数的分析表达，该表达表明，可以通过更改间隔距离以及它们距离色带边缘的距离来控制抗共和度的位置和宽度。这项工作构成了介观运输中多个FANO共鸣的明显例子。
Double-level quantum systems are good candidates for revealing coherent quantum transport properties. Here, we consider quantum interference effects due to the formation of a two-level system (TLS) coupled to the edge channel of a zigzag Phosphorene nanoribbon (ZPNR). Using the tight-binding approach, we first demonstrate the formation of a TLS in bulk Phosphorene sheet due to the existence of two nearby vacancy impurities. Then, we show that such a TLS can couple to the quasi-one-dimensional continuum of the edge states in a ZPNR which results in the the appearance of two-dip Fano-type line shapes. To this end, we generalize the Lippmann-Schwinger approach to study the scattering of edge electrons in a ZPNR by two coupled impurity defects. We obtain an analytical expression of the transmission coefficient which shows that the positions and widths of the anti-resonances can be controlled by changing the intervacancy distance as well as their distance from the edge of the ribbon. This work constitutes a clear example of the multiple Fano resonances in mesoscopic transport.
