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Title: Resonant spin transport through lateral ferromagnet-quantum dot-ferromagnet sandwich device
Authors: Chen, W.
Jalil, M.B.A. 
Tan, S.G. 
Issue Date: 2008
Citation: Chen, W., Jalil, M.B.A., Tan, S.G. (2008). Resonant spin transport through lateral ferromagnet-quantum dot-ferromagnet sandwich device. Journal of Applied Physics 103 (7) : -. ScholarBank@NUS Repository.
Abstract: The spin transport was investigated in a system composed of a quantum dot sandwiched between two ferromagnetic metal contacts (FM-QD-FM) based on the Keldysh nonequilibrium Green's function formalism. The calculated spin current shows sharp resonant peaks in the intradot state εd, with energy separation given by the Coulomb interaction energy. The relative magnitude of the spin current peaks is strongly influenced by QD's occupation number, which can be tuned by changing the lead-dot coupling energy. It was found that the spin-split chemical potential Δμ due to spin accumulation in the leads has a relatively smaller effect on the spin current than the leads' polarization ratio p. Interestingly, under condition of spin-antisymmetric electrochemical potentials μα in the leads, the magnitude of the spin current reduces with increasing p, and that a pure spin current occurs only when p=0. © 2008 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.2836710
Appears in Collections:Staff Publications

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