中国物理B ›› 2008, Vol. 17 ›› Issue (4): 1383-1388.doi: 10.1088/1674-1056/17/4/038

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

Spin-polarized transport through the T-shaped double quantum dots

羊富彬1, 吴绍全1, 闫从华1, 侯涛1, 毕爱华1, 黄睿2   

  1. (1)College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China; (2)Southwest Petroleum University, College of Sciences, Nanchong 610500, China
  • 收稿日期:2007-08-25 修回日期:2007-09-28 出版日期:2008-04-01 发布日期:2008-04-01
  • 基金资助:
    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).

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)   

  1. a College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China; b Southwest Petroleum University, College of Sciences, Nanchong 610500, China
  • Received:2007-08-25 Revised:2007-09-28 Online:2008-04-01 Published:2008-04-01
  • Supported by:
    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).

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摘要： 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.

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.

Key words: spin polarized transport, Fano--Kondo effect, quantum dots

中图分类号:  (Spin polarized transport)

  • 72.25.-b
73.21.La (Quantum dots) 75.20.Hr (Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions) 79.60.Jv (Interfaces; heterostructures; nanostructures)