Carbon nanotube-based quantum spin pump

Physics

Scientific paper

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Scientific paper

By cyclic variation of the magnetic field and electric field, we investigate the spin current of a carbon nanotube-based molecular quantum spin pump. At finite frequencies, we calculate the spin current to the second order in pumping amplitudes. In the presence of the magnetic field, a pure spin current without accompanying charge current is generated at zero bias voltage. The photon-assisted process is clearly observed in the spin current.

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