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

中国物理B ›› 2011, Vol. 20 ›› Issue (12): 127202-127202.doi: 10.1088/1674-1056/20/12/127202

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

叶成芝¹, 聂一行², 梁九卿²

(1)Institute of Condensed Matter Physics and School of Sciences, Linyi University, Linyi 276005, Shandong Province, China; (2)Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China

收稿日期:2011-08-01 修回日期:2011-10-18 出版日期:2011-12-15 发布日期:2011-12-15
基金资助:
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).

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

Ye Cheng-Zhi(叶成芝)^a)†, Nie Yi-Hang(聂一行)^b), and Liang Jiu-Qing(梁九卿)^b)

^a Institute of Condensed Matter Physics and School of Sciences, Linyi University, Linyi 276005, Shandong Province, China; ^b Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China

Received:2011-08-01 Revised:2011-10-18 Online:2011-12-15 Published:2011-12-15
Supported by:
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).

摘要/Abstract

摘要： 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.

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.

Key words: Rashba spin-orbit coupling, Andreev reflection, pure spin current without net charge current

中图分类号: (Spin polarized transport in semiconductors)

72.25.Dc

71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 74.45.+c (Proximity effects; Andreev reflection; SN and SNS junctions)

叶成芝, 聂一行, 梁九卿. A pure spin-current injector of semiconductor quantum dots with Andreev reflection and Rashba spin–orbit coupling[J]. 中国物理B, 2011, 20(12): 127202-127202.

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[J]. Chin. Phys. B, 2011, 20(12): 127202-127202.

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

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

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