Spin-polarized transport through the T-shaped double quantum dots
Yang Fu-Bin(羊富彬)a)†, Wu Shao-Quan(吴绍全)a), Yan Cong-Hua(闫从华)a),Huang Rui(黄睿)b), Hou Tao(侯涛)a), and Bi Ai-Hua(毕爱华)a)
a College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China; b Southwest Petroleum University, College of Sciences, Nanchong 610500, China
Abstract 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.
Received: 25 August 2007
Revised: 28 September 2007
Accepted manuscript online:
Fund: Project supported by the Scientific
Research Foundation of Sichuan Provincial Education, China (Grant No
2006A069), and Sichuan Provincial Research Foundation for Basic
Research, China (Grant No
2006J13-155).
Cite this article:
Yang Fu-Bin(羊富彬), Wu Shao-Quan(吴绍全), Yan Cong-Hua(闫从华),Huang Rui(黄睿), Hou Tao(侯涛), and Bi Ai-Hua(毕爱华) Spin-polarized transport through the T-shaped double quantum dots 2008 Chin. Phys. B 17 1383
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