中国物理B ›› 2012, Vol. 21 ›› Issue (11): 117201-117201.doi: 10.1088/1674-1056/21/11/117201

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

Spin-polarized current in double quantum dots

李爱仙a, 段素青b   

  1. a Graduate School of China Academy of Engineering Physics, Beijing 100088, China;
    b Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • 收稿日期:2012-03-04 修回日期:2012-05-03 出版日期:2012-10-01 发布日期:2012-10-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10874020 and 11174042), the National Basic Research Program of China (Grants No. 2011CB922204), the CAEP, China (Grant No. 2011B0102024), and the SRF for ROCS, SEM, China.

Spin-polarized current in double quantum dots

Li Ai-Xian (李爱仙)a, Duan Su-Qing (段素青 )b   

  1. a Graduate School of China Academy of Engineering Physics, Beijing 100088, China;
    b Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • Received:2012-03-04 Revised:2012-05-03 Online:2012-10-01 Published:2012-10-01
  • Contact: Li Ai-Xian E-mail:liaixian0123@sina.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10874020 and 11174042), the National Basic Research Program of China (Grants No. 2011CB922204), the CAEP, China (Grant No. 2011B0102024), and the SRF for ROCS, SEM, China.

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摘要： We analyze the transport through an asymmetric double quantum dots with an inhomogeneous Zeeman splitting in the presence of crossed dc and ac magnetic fields. A strong spin-polarized current can be obtained by changing the dc magnetic field. It is mainly due to the resonant tunneling. But for the ferromagnetic right electrode, the electron spin resonance also plays an important role in transport. We show that the double quantum dots with three-level mixing under crossed dc and ac magnetic fields can act not only as a bipolar spin filter but also as a spin inverter under suitable conditions.

关键词: resonant tunneling, spin-polarized current, spin filter, double quantum dots

Abstract: We analyze the transport through an asymmetric double quantum dots with an inhomogeneous Zeeman splitting in the presence of crossed dc and ac magnetic fields. A strong spin-polarized current can be obtained by changing the dc magnetic field. It is mainly due to the resonant tunneling. But for the ferromagnetic right electrode, the electron spin resonance also plays an important role in transport. We show that the double quantum dots with three-level mixing under crossed dc and ac magnetic fields can act not only as a bipolar spin filter but also as a spin inverter under suitable conditions.

Key words: resonant tunneling, spin-polarized current, spin filter, double quantum dots

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

  • 72.25.Dc
73.23.Hk (Coulomb blockade; single-electron tunneling) 73.63.Kv (Quantum dots)