Nonmagnetic control of spin flow: Generation of pure spin current in a Rashba-Dresselhaus quantum channel

被引：25

作者：

Lin, Chia-Hui ^{[1
]}

Tang, Chi-Shung ^{[2
]}

Chang, Yia-Chung ^{[1
]}

机构：

[1] Acad Sinica, Res Ctr Appl Sci, Taipei 11529, Taiwan

[2] Natl United Univ, Dept Mech Engn, Miaoli 36003, Taiwan

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 24期

关键词：

electron spin polarisation; spin-orbit interactions;

D O I：

10.1103/PhysRevB.78.245312

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate a spin pump to generate pure spin current of tunable intensity and polarization in the absence of charge current. The pumping functionality is achieved by means of an ac gate voltage that modulates the Rashba constant dynamically in a local region of a quantum channel with both static Rashba and Dresselhaus spin-orbit interactions. Spin-resolved Floquet scattering matrix is calculated to analyze the whole scattering process. Pumped spin current can be divided into spin-preserved transmission and spin-flip reflection parts. These two terms have opposite polarization of spin current and are competing with each other. Our proposed spin-based device can be utilized for nonmagnetic control of spin flow by tuning the ac gate voltage and the driving frequency.

引用

页数：6

共 37 条

[1] Spin filtering by a periodic spintronic device [J].