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

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 d...

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Bibliographic Details
Published in:Chinese physics B 2009-12, Vol.18 (12), p.5485-5490
Main Author: 彭菊 郁华玲 王之国
Format: Article
Language:English
Subjects:
Electric potential
Electronics
Gates
Interferometers
Magnetic flux
Quantum dots
Reflection
Voltage
干涉仪
电子电流
磁性金属
系统参数
自旋电流
金属铁
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/18/12/059