Spin-polarized current in a Rashba ring pumped by a microwave field |
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Authors: | L Zhang F Liang and J Wang |
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Institution: | (1) Department of Physics and Astronomy, Center for Nanoscale Science and Engineering, University of California, Riverside, CA 92521 |
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Abstract: | We report a theoretical study on generation of a spin polarized charge current with arbitrary spin polarization, including
the fully-spin-polarized current. In a two-terminal mesoscopic ring device, the Rashba spin-orbit coupling (RSOC) is considered
as well as a microwave field applied on one of arms of the ring. It is shown that at zero external bias a spin current can
be produced in addition to the usual charge current pumped by the microwave field, which is attributed to the the quantum
interference effect of the RSOC induced spin precession phase. By varying the system parameters such as the microwave frequency
and the RSOC strength, not only the
magnitude but also the direction of the spin current can be efficiently controlled, moreover, the spin-polarization degree
of the charge current can readily be tuned by these system parameters
in the range -1,1]. Since all the parameters can be controlled electrically in our study, the proposed device may shed light
on the possibility of an all-electrical generation and tuning of a
spin-polarized current in the field of the spintronics. |
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Keywords: | |
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