double quantum dot as detector of spin bias (a) (b)

下载该文档文档格式：PDF 更新时间：2009-10-01 下载次数：0 点击次数：1

文档基本属性

文档语言：

Simplified Chinese

文档格式：

pdf

文档作者：

ltdn

关键词：

主题：

备注：

点击这里显示更多文档属性

PHYSICAL REVIEW B 77, 195313 2008
Double quantum dot as detector of spin bias
Qing-feng Sun,1 Yanxia Xing,1 and Shun-Qing Shen2
1
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China 2Department of Physics, and Center of Theoretical and Computational Physics, the University of Hong Kong, Hong Kong, China Received 10 December 2007; revised manuscript received 6 March 2008; published 13 May 2008 It was proposed that a double quantum dot can be used as a detector of the spin bias. Electron transport through a double quantum dot is theoretically investigated when a pure spin bias is applied on two conducting leads in contact with the quantum dot. It is found that the spin polarization in the left and right dots may be spontaneously induced, while the intradot levels are located within the spin bias window and breaks the left-right symmetry of the two quantum dots. As a result, a large current emerges. For an open external circuit, a charge bias instead of a charge current will be induced at equilibrium, which is believed to be measurable according to the current nanotechnology. This method may provide a practical and whole electrical approach to detect the spin bias or the spin current by measuring the charge bias or current in a double quantum dot. DOI: 10.1103/PhysRevB.77.195313 PACS number s : 73.23. b, 85.75. d, 73.21.La, 85.35. p
I. INTRODUCTION

下一页

文档基本属性
文档语言：	Simplified Chinese
文档格式：	pdf
文档作者：	ltdn
关键词：
主题：
备注：
点击这里显示更多文档属性
经理：
单位：	微软系统
分类：
创建时间：
上次保存者：
修订次数：
编辑时间：
文档创建者：
修订：
加密标识：
幻灯片：
段落数：
字节数：
备注：
演示格式：
上次保存时间：