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.
Received: 14 January 2009
Revised: 11 May 2009
Accepted manuscript online:
PACS:
74.45.+c
(Proximity effects; Andreev reflection; SN and SNS junctions)
Fund: 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).
Cite this article:
Peng Ju(彭菊)$^†ger$,Yu Hua-Ling(郁华玲), and Wang Zhi-Guo(王之国) Nonlocal Andreev reflection and spin current in a three-terminal Aharonov--Bohm interferometer 2009 Chin. Phys. B 18 5485
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