中国物理B ›› 2012, Vol. 21 ›› Issue (7): 77201-077201.doi: 10.1088/1674-1056/21/7/077201

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

A spin switch device based on a triple quantum dots superlattice using the Dicke effect

安兴涛a b, 穆惠英c, 咸立芬a, 刘建军d   

  1. a School of Sciences, Hebei University of Science and Technology, Shijiazhuang 050018, China;
    b SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    c Department of Chemistry and Environmental Engineering, Hebei Chemical and Pharmaceutical Vocational Technology College, Shijiazhuang 050026, China;
    d Physics Department, Shijiazhuang University, Shijiazhuang 050035, China
  • 收稿日期:2011-12-28 修回日期:2012-01-18 出版日期:2012-06-01 发布日期:2012-06-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11047184, 11104059, and 61176089) and the Hebei Province Natural Science Foundation, China (Grant No. A2011208010).

A spin switch device based on a triple quantum dots superlattice using the Dicke effect

An Xing-Tao(安兴涛)a)b)†, Mu Hui-Ying(穆惠英)c), Xian Li-Fen(咸立芬)a), and Liu Jian-Jun(刘建军) d)   

  1. a School of Sciences, Hebei University of Science and Technology, Shijiazhuang 050018, China;
    b SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    c Department of Chemistry and Environmental Engineering, Hebei Chemical and Pharmaceutical Vocational Technology College, Shijiazhuang 050026, China;
    d Physics Department, Shijiazhuang University, Shijiazhuang 050035, China
  • Received:2011-12-28 Revised:2012-01-18 Online:2012-06-01 Published:2012-06-01
  • Contact: An Xing-Tao E-mail:anxt2005@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11047184, 11104059, and 61176089) and the Hebei Province Natural Science Foundation, China (Grant No. A2011208010).

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摘要： Spin-dependent transport in a triple quantum dots superlattice system with a bridge coupling to two leads is studied. There exists an odd–even parity oscillation of spin polarization at the central dot level εc = 0 due to the spin-dependent Fano and Dicke effects induced by the quantum interference and the Rashba spin–orbit interaction. In the case of even numbers of triple quantum dots, the device can be used as a spin switch by tuning the energy difference h between the energies of the central and the lateral dots. These results may be helpful to design and fabricate practical spintronic devices.

关键词: spin polarization, quantum dots

Abstract: Spin-dependent transport in a triple quantum dots superlattice system with a bridge coupling to two leads is studied. There exists an odd–even parity oscillation of spin polarization at the central dot level εc = 0 due to the spin-dependent Fano and Dicke effects induced by the quantum interference and the Rashba spin–orbit interaction. In the case of even numbers of triple quantum dots, the device can be used as a spin switch by tuning the energy difference h between the energies of the central and the lateral dots. These results may be helpful to design and fabricate practical spintronic devices.

Key words: spin polarization, quantum dots

中图分类号:  (Spin polarized transport in semiconductors)

  • 72.25.Dc
73.23.-b (Electronic transport in mesoscopic systems) 85.35.Ds (Quantum interference devices)