Nonlocal pure spin current injection via quantum pumping and crossed Andreev reflection

Colin Benjamin; Roberta Citro

doi:10.1103/PhysRevB.72.085340

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Nonlocal pure spin current injection via quantum pumping and crossed Andreev reflection

Colin Benjamin, Roberta Citro

DOI 10.1103/PhysRevB.72.085340 · Physical Review B

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Abstract

A pure spin current injector is proposed based on adiabatic pumping and crossed normal and 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 nonlocal injection of a pure spin current into the semiconductor. The experimental realization of the proposed device is also discussed.