Selective Spin Injection Controlled by Electrical way in Ferromagnet/Quantum Dot/Semiconductor system

Details Selective Spin Injection Controlled by Electrical way in Ferromagnet/Quantum Dot/Semiconductor system Selective Spin Injection Controlled by Electrical way in Ferromagnet/Quantum Dot/Semiconductor system

2008-01-18

arxiv.org/abs/0801.2922v1

Physics Letters A 372, 695 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1016/j.physleta.2007.07.081

Selective and large polarization of current injected into semiconductor (SC) is predicted in Ferromagnet (FM)/Quantum Dot (QD)/SC system by varying the gate voltage above the Kondo temperature. In addition, spin-dependent Kondo effect is also revealed below Kondo temperature. It is found that Kondo resonances for up spin state is suppressed with increasing of the polarization P of the FM lead. While the down one is enhanced. The Kondo peak for up spin is disappear at P=1.

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