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Using the Keldysh nonequilibrium Green function and equation-of-motion technique, this paper investigates the spin-polarized transport properties of the T-shaped double quantum dots (DQD) coupled to two ferromagnetic leads. There are both Fano effect and Kondo effect in the system, and due to their mutual interaction, the density of states, the current, and the differential conductance of the system depend sensitively on the spin-polarized strength. Thus the obtained results show that this system is provided with excellent spin filtering property, which indicates that this system may be a candidate for spin valve transistors in the spintronics. 相似文献
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Spin-flip process through double quantum dots coupled to two half-metallic ferromagnetic leads 下载免费PDF全文
We investigate the spin-flip process through double quantum dots
coupled to two half-metallic ferromagnetic leads in series. By means
of the slave-boson mean-field approximation, we calculate the
density of states in the Kondo regime for two different
configurations of the leads. It is found that the transport shows
some remarkable properties depending on the spin-flip strength.
These effects may be useful in exploiting the role of electronic
correlation in spintronics. 相似文献
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Using an equation of motion technique, we report on a theoretical analysis of transport characteristics of a spin-valve system formed by a quantum dot coupled to ferromagnetic leads, whose magnetic moments are oriented at an angle θ with respect to each other, and a mesoscopic ring by the Anderson Hamiltonian. We analyse the density of states of this system, and our results reveal that the density of states show some noticeable characteristics depending on the relative angle θ of magnetic moment M, and the spin-polarised strength P in ferromagnetic leads, and also the magnetic flux Φ and the number of lattice sites NR in the mesoscopic ring. These effects might have some potential applications in spintronics. 相似文献
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Spin-flip process through double quantum dots coupled to two half-metallic ferromagnetic leads 下载免费PDF全文
We investigate the spin-flip process through double quantum dots coupled to two half-metallic ferromagnetic leads in series. By means of the slave-boson mean-field approximation, we calculate the density of states in the Kondo regime for two different configurations of the leads. It is found that the transport shows some remarkable properties depending on the spin-flip strength. These effects may be useful in exploiting the role of electronic correlation in spintronics. 相似文献
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