中国物理B ›› 2009, Vol. 18 ›› Issue (2): 783-789.doi: 10.1088/1674-1056/18/2/062

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Fano--Kondo effect in the T-shaped double quantum dots coupled to ferromagnetic leads

侯涛, 吴绍全, 毕爱华, 羊富彬, 陈嘉峰, 樊梦   

  1. College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China
  • 收稿日期:2008-05-20 修回日期:2008-07-17 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the Scientific Research Funds of Education Department of Sichuan Province (Grant No 2006A069), the Major Basic Research Project of Sichuan Province (Grant No 2006J13-155), and the Scientific Research Innovation for Postgraduates of Si

Fano--Kondo effect in the T-shaped double quantum dots coupled to ferromagnetic leads

Hou Tao(侯涛)†, Wu Shao-Quan(吴绍全), Bi Ai-Hua(毕爱华), Yang Fu-Bin(羊富彬), Chen Jia-Feng(陈嘉峰), and Fan Meng(樊梦)   

  1. College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China
  • Received:2008-05-20 Revised:2008-07-17 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the Scientific Research Funds of Education Department of Sichuan Province (Grant No 2006A069), the Major Basic Research Project of Sichuan Province (Grant No 2006J13-155), and the Scientific Research Innovation for Postgraduates of Si

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摘要： Using an equation-of-motion technique, we theoretically study the Fano--Kondo effect in the T-shaped double quantum dots coupled to two ferromagnetic leads by the Anderson Hamiltonian. We calculate the density of states in this system with both parallel and antiparallel lead-polarization alignments, and our results reveal that the interdot coupling, the spin-polarized strength and the energy level of the side coupled quantum dot greatly influence the density of states of the central quantum dot. This system is a possible candidate for spin valve transistors and may have potential applications in the spintronics.

Abstract: Using an equation-of-motion technique, we theoretically study the Fano--Kondo effect in the T-shaped double quantum dots coupled to two ferromagnetic leads by the Anderson Hamiltonian. We calculate the density of states in this system with both parallel and antiparallel lead-polarization alignments, and our results reveal that the interdot coupling, the spin-polarized strength and the energy level of the side coupled quantum dot greatly influence the density of states of the central quantum dot. This system is a possible candidate for spin valve transistors and may have potential applications in the spintronics.

Key words: Fano--Kondo effect, density of states, quantum dots

中图分类号:  (Quantum dots)

  • 73.63.Kv
73.21.La (Quantum dots) 72.25.Mk (Spin transport through interfaces) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))