Supercurrent reversal in quantum dots induced by spin-pump effects

被引：10
|
作者：
Pan, Hui [1 ]
Lin, Tsung-Han
机构：
[1] Beijing Univ Aeronaut & Astronaut, Dept Phys, Beijing 100083, Peoples R China
[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
来源：
PHYSICAL REVIEW B | 2007年 / 75卷 / 19期
关键词：
D O I：
10.1103/PhysRevB.75.195305
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The spin-pump effects caused by the rotating magnetic field on the supercurrent in a superconductor-quantum-dot-superconductor system are studied theoretically. By tuning the magnetic-field strength, the sign of the supercurrent can be changed from positive to negative, which results in the pi-junction transition. The pi-junction transition can also be tuned by the quantum dot energy level. The tunable pi-junction transition is interpreted in the picture of the current carrying density of states, which clearly shows the enhancement, suppression, and reversion of the supercurrent.
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页数：7
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