TITLE

Spin bias measurement based on a quantum point contact

AUTHOR(S)
Xing, Yanxia; Sun, Qing-feng; Wang, Jian
PUB. DATE
October 2008
SOURCE
Applied Physics Letters;10/6/2008, Vol. 93 Issue 14, p142107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
34850449

 

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