Tunable supercurrent in a triangular triple quantum dot system

被引：5

作者：

Bai, Long ^{[1
,2
,3
]}

Zhang, Qingyun ^{[1
,2
]}

Jiang, Liang ^{[1
,2
]}

Zhang, Zhengzhong ^{[1
,2
]}

Shen, R. ^{[1
,2
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China

[3] China Univ Min & Technol, Coll Sci, Xuzhou 221008, Peoples R China

来源：

PHYSICS LETTERS A | 2010年 / 374卷 / 25期

基金：

中国国家自然科学基金;

关键词：

Supercurrent; Quantum dot; ANDREEV REFLECTION; JUNCTION;

D O I：

10.1016/j.physleta.2010.04.031

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The supercurrent in a triangular triple quantum dot system is investigated by using the nonequilibrium Green's function method. It is found that the sign of the supercurrent can be changed from positive to negative with increasing the strength of spin-flip scattering, resulting in the pi-junction transition. The supercurrent and the pi-junction transition are also modulated by tuning the system parameters such as the gate voltage and the interdot coupling. The tunable pi-junction transition is explained in terms of the current carrying density of states. These results provide the ways of manipulating the supercurrent in a triple quantum dot system. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：2584 / 2588

页数：5

共 34 条

[1] Control of Andreev-level occupation in a Josephson junction by a normal-metal probe [J].