DC JOSEPHSON CURRENT THROUGH A QUANTUM-DOT COUPLED WITH SUPERCONDUCTING LEADS

被引：51
|
作者：
ISHIZAKA, S [1 ]
SONE, J [1 ]
ANDO, T [1 ]
机构：
[1] UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN
来源：
PHYSICAL REVIEW B | 1995年 / 52卷 / 11期
关键词：
D O I：
10.1103/PhysRevB.52.8358
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The transport in a superconductor-quantum-dot-superconductor tunnel junction with a Coulomb repulsion in the dot was studied numerically. We calculated the de Josephson current by noncrossing approximations varying the strength of the Coulomb repulsion. The critical current has a peak structure that is a function of the energy-level position in the dot, but the number of the peaks changes depending on the temperature, the strength of electron tunneling, and the Coulomb repulsion. It has been predicted previously that the junction behaves as a pi junction for an infinitely strong Coulomb repulsion. We obtained the conditions for the strength of the Coulomb repulsion necessary for the pi junction.
引用
收藏
页码：8358 / 8362
页数：5
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