Phys. Rev. B 75, 195305 (2007) [7 pages]Supercurrent reversal in quantum dots induced by spin-pump effectsReceived 5 February 2007; published 4 May 2007 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 π-junction transition. The π-junction transition can also be tuned by the quantum dot energy level. The tunable π-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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.195305
DOI:
10.1103/PhysRevB.75.195305
PACS:
74.45.+c, 73.23.−b, 73.63.Kv
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