科研之友
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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.
- 出版日期2007-5
- 单位北京大学
