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Spin filter effects in an Aharonov-Bohm ring with double quantum dots under general Rashba spin-orbit interactions

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Title: Spin filter effects in an Aharonov-Bohm ring with double quantum dots under general Rashba spin-orbit interactions
Authors: Kondo, Kenji Browse this author →KAKEN DB
Keywords: spintronics
spin-orbit interaction
general Rashba effect
Aharonov-Bohm ring
spin filter
Issue Date: Jan-2016
Publisher: IOP Publishing
Journal Title: New Journal of Physics
Volume: 18
Start Page: 013002
Publisher DOI: 10.1088/1367-2630/18/1/013002
Abstract: Many researchers have reported on spin filters using linear Rashba spin-orbit interactions (SOI). However, spin filters using square and cubic Rashba SOIs have not yet been reported. We consider that this is because the. Aharonov-Casher (AC) phases acquired under square and cubic Rashba SOIs are ambiguous. In this study, we try to derive the AC phases acquired under square and cubic Rashba SOIs from the viewpoint of non-Abelian SU(2) gauge theory. These AC phases can be derived successfully from the non-Abelian SU(2) gauge theory without the completing square methods. Using the results, we investigate the spin filtering in a double quantum dot (QD) Aharonov-Bohm (AB) ring under linear, square, and cubic Rashba SOIs. This AB ring consists of elongated QDs and quasi-one-dimensional quantum nanowires under an external magnetic field. The spin transport is investigated from the left nanowire to the right nanowire in the above structure within the tight-binding approximation. In particular, we focus on the difference of spin filtering among linear, square, and cubic Rashba SOIs. The calculation is performed for the spin polarization by changing the penetrating magnetic flux for the AB ring subject to linear, square, and cubic Rashba SOIs. It is found that perfect spin filtering is achieved for all of the Rashba SOIs. This result indicates that this AB ring under general Rashba SOIs can be a promising device for spin current generation. Moreover, the AB rings under general Rashba SOIs behave in totally different ways in response to penetrating magnetic flux, which is attributed to linear, square, and cubic behaviors in the in-plane momentum. This result enables us to make a clear distinction between linear, square, and cubic Rashba SOIs according to the peak position of the perfect spin filtering.
Rights: © 2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
http://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/61390
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 近藤 憲治

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