Spin bias measurement based on a quantum point contact

被引：14

作者：

Xing, Yanxia ^{[1
,2
]}

Sun, Qing-Feng ^{[1
,2
]}

Wang, Jian ^{[3
,4
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[3] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[4] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 14期

关键词：

D O I：

10.1063/1.2999587

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electron charge transport through a quantum point contact (QPC) driven by an asymmetric spin bias (SB) is studied. A large charge current is induced when the transmission coefficient of the QPC jumps from one integer plateau to the next. Furthermore, for an open external circuit, the induced charge bias instead of the charge current is found to be quite large. It provides an efficient and practical way to detect SB by using a very simple device, a QPC or a STM tip. In addition, with the aid of magnetic field, polarization direction of the SB can also be determined. (C) 2008 American Institute of Physics.

引用

页数：3

共 29 条

[1] Conserved spin and orbital angular momentum Hall current in a two-dimensional electron system with Rashba and Dresselhaus spin-orbit coupling [J].