Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-02-24
Phys. Rev. B 72, 085340 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 6 figures, 1 table; Accepted for publication in Physical Review B
Scientific paper
10.1103/PhysRevB.72.085340
A pure spin current injector is proposed based on adiabatic pumping and crossed normal/Andreev reflection. The device consists of a three-terminal ferromagnet-superconductor-semiconductor system in which the injection of a pure spin current is into the semiconductor which is coupled to the superconductor within a coherence length away from the ferromagnet enabling the phenomena of crossed normal /Andreev reflection to operate. Quantum pumping is induced by adiabatically modulating two independent parameters of the ferromagnetic lead, namely the magnetization strength and the strength of coupling between the ferromagnet and the superconductor. The competition between the normal/Andreev reflection and the crossed normal/Andreev reflection, both induced by pumping, leads to non-local injection of a pure spin current into the semiconductor. The experimental realization of the proposed device is also discussed.
Benjamin Colin
Citro Roberta
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