中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5485-5490.doi: 10.1088/1674-1056/18/12/059

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Nonlocal Andreev reflection and spin current in a three-terminal Aharonov--Bohm interferometer

彭菊, 郁华玲, 王之国   

  1. Department of Physics, Huaiyin Teachers College, Huaian 223001, China
  • 收稿日期:2009-01-14 修回日期:2009-05-11 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the Special Funds of the National Natural Science Foundation of China (Grant Nos 10847133 and 10847132), and the Natural Science Foundation of Education Bureau of Jiangsu Province, China (Grant No 08KJB140002).

Nonlocal Andreev reflection and spin current in a three-terminal Aharonov--Bohm interferometer

Peng Ju(彭菊)$^†ger$,Yu Hua-Ling(郁华玲), and Wang Zhi-Guo(王之国)   

  1. Department of Physics, Huaiyin Teachers College, Huaian 223001, China
  • Received:2009-01-14 Revised:2009-05-11 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the Special Funds of the National Natural Science Foundation of China (Grant Nos 10847133 and 10847132), and the Natural Science Foundation of Education Bureau of Jiangsu Province, China (Grant No 08KJB140002).

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摘要： This paper theoretically reports the nonlocal Andreev reflection and spin current in a normal metal-ferromagnetic metal-superconducting Aharonov--Bohm interferometer. It is found that the electronic current and spin current are sensitive to systematic parameters, such as the gate voltage of quantum dots and the external magnetic flux. The electronic current in the normal metal lead results from two competing processes: quasiparticle transmission and nonlocal Andreev reflection. The appearance of zero spin-up electronic current (or spin-down electronic current) signals the existence of nonlocal Andreev reflection, and the presence of zero electronic current results in the appearance of pure spin current.

Abstract: This paper theoretically reports the nonlocal Andreev reflection and spin current in a normal metal-ferromagnetic metal-superconducting Aharonov--Bohm interferometer. It is found that the electronic current and spin current are sensitive to systematic parameters, such as the gate voltage of quantum dots and the external magnetic flux. The electronic current in the normal metal lead results from two competing processes: quasiparticle transmission and nonlocal Andreev reflection. The appearance of zero spin-up electronic current (or spin-down electronic current) signals the existence of nonlocal Andreev reflection, and the presence of zero electronic current results in the appearance of pure spin current.

Key words: nonlocal Andreev reflection, Aharonov--Bohm interferometer, spin current

中图分类号:  (Proximity effects; Andreev reflection; SN and SNS junctions)

  • 74.45.+c
07.60.Ly (Interferometers) 72.25.Mk (Spin transport through interfaces) 73.23.-b (Electronic transport in mesoscopic systems) 74.50.+r (Tunneling phenomena; Josephson effects) 74.78.Na (Mesoscopic and nanoscale systems)