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- W2621242078 abstract "Using a minimum model consisting of a magnetic quantum dot and an electron lead, we investigate spin pumping by its precessing magnetization. Focusing on the adiabaticity, which is quantified using a comparison between the frequency of precession and the relaxation rate of the relevant system, we investigate the role of nonadiabaticity in spin pumping by obtaining the dependence of the spin current generated on the frequency of precession using full counting statistics. This evaluation shows that the steady-state population of the quantum dot remains unchanged by the precession owing to the rotational symmetry about the axis of precession. This implies that in the adiabatic limit the spin current is absent and that spin pumping is entirely a nonadiabatic effect. We also find that the nonadiabatic spin current depends linearly on the frequency in the low-frequency regime and exhibits an oscillation in the high-frequency regime. The oscillation points to an enhancement of spin pumping by tuning the frequency of precession." @default.
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- W2621242078 date "2017-08-30" @default.
- W2621242078 modified "2023-09-23" @default.
- W2621242078 title "Nonadiabaticity in spin pumping under relaxation" @default.
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- W2621242078 doi "https://doi.org/10.1103/physrevb.96.064439" @default.
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