Calle A M, Pacheco M, Martins G B, Apel V M, Lara G A, Orellana P A
Departamento de Física, Universidad Técnica Federico Santa María, Casilla 110 V, Valparaíso, Chile.
J Phys Condens Matter. 2017 Apr 5;29(13):135301. doi: 10.1088/1361-648X/aa58c1. Epub 2017 Jan 11.
In the present work, we investigate the electronic transport through a T-shape double quantum dot system coupled to two normal leads and to one superconducting lead. We explore the interplay between Kondo and Andreev states due to proximity effects. We find that Kondo resonance is modified by the Andreev bound states, which manifest through Fano antiresonances in the local density of states of the embedded quantum dot and normal transmission. This means that there is a correlation between Andreev bound states and Fano resonances that is robust under the influence of high electronic correlation. We have also found that the dominant couplings at the quantum dots are characterized by a crossover region that defines the range where the Fano-Kondo and the Andreev-Kondo effect prevail in each quantum dot. Likewise, we find that the interaction between Kondo and Andreev bound states has a notable influence on the Andreev transport.
在本工作中，我们研究了通过一个与两个正常引线和一个超导引线耦合的T形双量子点系统的电子输运。我们探索了由于近邻效应导致的近藤态和安德列夫态之间的相互作用。我们发现，安德列夫束缚态会修改近藤共振，这通过嵌入量子点的局域态密度中的法诺反共振和正常透射表现出来。这意味着安德列夫束缚态与法诺共振之间存在一种相关性，这种相关性在高电子关联的影响下是稳健的。我们还发现，量子点处的主导耦合由一个交叉区域表征，该区域定义了每个量子点中法诺-近藤效应和安德列夫-近藤效应占主导的范围。同样，我们发现近藤束缚态与安德列夫束缚态之间的相互作用对安德列夫输运有显著影响。
