Dynamic $0-π$ transition induced by pumping mechanism

Details Dynamic $0-π$ transition induced by pumping mechanism Dynamic $0-π$ transition induced by pumping mechanism

2006-11-06

arxiv.org/abs/cond-mat/0611134v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Using Nambu$\otimes $spin space Keldysh Green's function approach, we present a nonequilibrium charge and spin pumping theory of a quantum dot in the mico-cavity coupled to two superconducting leads. It is found that the charge currents include two parts: The dissipationless supercurrent standing for the transfer of coherent Cooper pairs and the pumped quasi-particle current. The supercurrent exhibits a dynamic $0-\pi $ transition induced by the frequency and strength of the $\sigma_{-}$ polarized laser field. This dynamic transition is not affected by the strong Coulomb interaction. Especially, the spin current appears and is an even function of the phase difference between two superconductors when the frequency of the polarized laser field is larger than two times superconducting energy gap. Our theory serves as an extension to non-superconducting spintronics.

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