Magnetically tunable spin-polarization of the current through a double quantum dot device

被引：2

作者：

Pan, Hui ^{[1
]}

Wang, Cong ^{[1
]}

Duan, Su-Qing ^{[2
]}

Chu, Wei-Dong ^{[2
]}

Zhang, Wei ^{[2
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Dept Phys, Beijing 100083, Peoples R China

[2] Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2008年 / 148卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

coupled quantum dots; Coulomb-blockade; spin-dependent transport; spin-flip effects;

D O I：

10.1016/j.ssc.2008.07.003

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We theoretically study the spin-dependent transport in a double quantum dot device connected with normal-metal and ferromagnetic leads by using the nonequilibrium Green's function method. In the absence of an external magnetic field, the current polarization is zero for a range of positive bias, while it is a relatively large value for a negative bias. In the presence of an external magnetic field perpendicular to the magnetization of the lead, the spin-flip effects make the current spin-polarized for both of the positive and negative bias. Thus the device can operate as a magnetically tunable spin-polarized current diode. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：69 / 73

页数：5

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