中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5485-5490.doi: 10.1088/1674-1056/18/12/059
彭菊, 郁华玲, 王之国
Peng Ju(彭菊)$^†ger$,Yu Hua-Ling(郁华玲), and Wang Zhi-Guo(王之国)
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.
中图分类号: (Proximity effects; Andreev reflection; SN and SNS junctions)