Zhu R. and Berakdar J.
Phys. Rev. B 81, pp 014403 (2010)We study the pump current and noise properties in an adiabatically modulated magnetic nanowire with double domain walls (DWs). The modulation is brought about by applying a slowly oscillating magnetic and electric fields with a controllable phase difference. The pumping mechanism resembles the case of the quantum dot pump with two-oscillating gates. The pump current, shot noise, and heat flow show peaks when the Fermi energy matches with the spin-split resonant levels localized between the DWs. The peak height of the pump current is an indicator for the lifetime of the spin-split quasistationary states between the DWs. For sharp DWs, the energy absorption from the oscillating fields results in sideband formations observable in the pump current. The pump noise carries information on the correlation properties between the nonequilibrium electrons and the quasiholes created by the oscillating scatterer. The ratio between the pump shot noise and the heat flow serves as an indicator for quasiparticle correlation.
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