Quantum Transport through a Triple Quantum Dot System in the Presence of Majorana Bound States
Quantum Transport through a Triple Quantum Dot System in the Presence of Majorana Bound States
复制标题
存在马约拉纳束缚态时通过三量子点系统的量子传输
DOI：
10.1088/0253-6102/65/5/622
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发表时间：
2016-05
影响因子：
3.1
通讯作者：
Zhong, Cheng-Cheng
中科院分区：
文献类型：
--
作者：
Jiang, Zhao-Tan;Cao, Zhi-Yuan;Zhong, Cheng-Cheng
利用非平衡绿色函数方法研究了电子通过由三个量子点和两个马约拉纳束缚态组成的特殊量子点结构的输运。这种QD-MBS环结构包括两个通道，其中两个耦合的MBS是通道1，一个QD是通道2，以及三种类型的传输过程，例如电子透射（ET）、安德烈耶夫反射（AR）和交叉安德烈耶夫反射（CAR）。通过比较通道1和通道2中的ET、AR和CAR过程，我们对QD-MBS环的输运性质进行了系统的研究。结果表明，通道1和通道2存在两种特征输运模式，以及这两种模式之间的相互作用。特别感兴趣的是，在通道2中存在AR辅助的ET过程，这与通道1中的AR辅助的ET过程不同。因此，由于ET和AR过程，在ET、AR和CAR透射系数中出现了明显的“X”图案。此外，我们研究了当通道1在ET和CAR制度下调谐时，通道2如何影响这三个传输过程。结果表明，ET，AR和CAR过程的输运性质可以通过调节嵌入在通道2中的QD的能级来调节。我们相信，这一研究将有助于了解量子点-MBS耦合系统中的输运性质。
We study the electron transport through a special quantum-dot (QD) structure composed of three QDs and two Majorana bound states (MBSs) using the nonequilibrium Green's function technique. This QD-MBS ring structure includes two channels with the two coupled MBSs being Channel 1 and one QD being Channel 2, and three types of transport processes such as the electron transmission (ET), the Andreev reflection (AR), and the crossed Andreev reflection (CAR). By comparing the ET, AR, and CAR processes through Channels 1 and 2, we make a systematic study on the transport properties of the QD-MBS ring. It is shown that there appear two kinds of characteristic transport patterns for Channels 1 and 2, as well as the interplay between the two patterns. Of particular interest is that there exists an AR-assisted ET process in Channel 2, which is different from that in Channel 1. Thus a clear "X" pattern due to the ET and AR processes appears in the ET, AR, and CAR transmission coefficients. Moreover, we study how Channel 2 affects the three transport processes when Channel 1 is tuned in the ET and CAR regimes. It is shown that the transport properties of the ET, AR and CAR processes can be adjusted by tuning the energy level of the QD embedded in Channel 2. We believe this research should be a helpful reference for understanding the transport properties in the QD-MBS coupled systems.
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