A pure spin-current injector of semiconductor quantum dots with Andreev reflection and Rashba spin–orbit coupling

doi:10.1088/1674-1056/20/12/127202

Abstract We propose a four-terminal device consisting of two parallel quantum dots with Rashba spin-orbit interaction (RSOI), coupled to two side superconductor leads and two common ferromagnetic leads, respectively. The two ferromagnetic leads and two quantum dots form a ring threaded by Aharonov-Bohm (AB) flux. This device possesses normal quasiparticle transmission between the two ferromagnetic leads, and normal and crossed Andreev reflections providing conductive holes. For the appropriate spin polarization of the ferromagnetic leads, RSOI and AB flux, the pure spin-up (or spin-down) current without net charge current in the right lead, which is due to the equal numbers of electrons and holes with the same spin-polarization moving along the same direction, can be obtained by adjusting the gate voltage, which may be used in practice as a pure spin-current injector.

Keywords: Rashba spin-orbit coupling Andreev reflection pure spin current without net charge current

Received: 01 August 2011
Revised: 18 October 2011
Accepted manuscript online:

PACS:	72.25.Dc	(Spin polarized transport in semiconductors)
	71.70.Ej	(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
	74.45.+c	(Proximity effects; Andreev reflection; SN and SNS junctions)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10775091, 10774094, 10974124, and 11047172), the Excellent Youth and Midlife Scientist Scientific Research Encouragement Foundation of Shandong Province, China (Grant No. BS2010DS006), and the Doctor Research Startup Foundation of Linyi University, China (Grant No. BS201023).

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Ye Cheng-Zhi(叶成芝), Nie Yi-Hang(聂一行), and Liang Jiu-Qing(梁九卿) A pure spin-current injector of semiconductor quantum dots with Andreev reflection and Rashba spin–orbit coupling 2011 Chin. Phys. B 20 127202

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A pure spin-current injector of semiconductor quantum dots with Andreev reflection and Rashba spin–orbit coupling

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