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通过耦合泊松非平衡格林函数形式，连接到超导引线的正常介观区域中的单电荷电流。

Single charge current in a normal mesoscopic region attached to superconductor leads via a coupled poisson nonequilibrium green function formalism.

作者信息

Verrilli David, Marin F P, Rangel Rafael

机构信息

Laboratorio de Física Teórica de Sólidos (LFTS), Centro de Física Teórica y Computacional (CEFITEC), Facultad de Ciencias, Universidad Central de Venezuela, A.P. 47586, Caracas 1041-A, Venezuela.

Departamento de Física, Universidad Simón Bolívar, A.P. 89000, Caracas 1080-A, Venezuela.

出版信息

ScientificWorldJournal. 2014;2014:721671. doi: 10.1155/2014/721671. Epub 2014 Apr 9.

DOI:10.1155/2014/721671
PMID:24977220
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4000988/
Abstract

We study the I-V characteristic of mesoscopic systems or quantum dot (QD) attached to a pair of superconducting leads. Interaction effects in the QD are considered through the charging energy of the QD; that is, the treatment of current transport under a voltage bias is performed within a coupled Poisson nonequilibrium Green function (PNEGF) formalism. We derive the expression for the current in full generality but consider only the regime where transport occurs only via a single particle current. We show for this case and for various charging energies values U 0 and associated capacitances of the QD the effect on the I-V characteristic. Also the influence of the coupling constants on the I-V characteristic is investigated. Our approach puts forward a novel interpretation of experiments in the strong Coulomb regime.

摘要

我们研究了连接到一对超导引线的介观系统或量子点（QD）的电流-电压特性。通过量子点的充电能量来考虑量子点中的相互作用效应；也就是说，在耦合泊松非平衡格林函数（PNEGF）形式体系内进行电压偏置下的电流输运处理。我们在完全一般的情况下推导了电流表达式，但仅考虑了仅通过单粒子电流发生输运的情况。我们展示了在这种情况下以及对于各种充电能量值U 0和量子点的相关电容对电流-电压特性的影响。还研究了耦合常数对电流-电压特性的影响。我们的方法对强库仑 regime 中的实验提出了一种新颖的解释。

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