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Title: Spin-polarized current generated by magneto-electrical gating
Authors: Ma, M. 
Jalil, M.B.A. 
Tan, S.G. 
Keywords: Non-equilibrium Greens function
Single electron tunneling
Spin polarized current
Issue Date: Aug-2012
Citation: Ma, M., Jalil, M.B.A., Tan, S.G. (2012-08). Spin-polarized current generated by magneto-electrical gating. Journal of Magnetism and Magnetic Materials 324 (15) : 2392-2396. ScholarBank@NUS Repository.
Abstract: We theoretically study spin-polarized current through a single electron tunneling transistor (SETT), in which a quantum dot (QD) is coupled to non-magnetic source and drain electrodes via tunnel junctions, and gated by a ferromagnetic (FM) electrode. The I-V characteristics of the device are investigated for both spin and charge currents, based on the non-equilibrium Greens function formalism. The FM electrode generates a magnetic field, which causes a Zeeman spin-splitting of the energy levels in the QD. By tuning the size of the Zeeman splitting and the source-drain bias, a fully spin-polarized current is generated. Additionally, by modulating the electrical gate bias, one can effect a complete switch of the polarization of the tunneling current from spin-up to spin-down current, or vice versa. © 2012 Elsevier B.V. All rights reserved.
Source Title: Journal of Magnetism and Magnetic Materials
ISSN: 03048853
DOI: 10.1016/j.jmmm.2012.03.011
Appears in Collections:Staff Publications

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