Issue 12, 2012

An electrically controlled quantum dot based spin current injector

Abstract

We present a proposal for a fully electrically controllable quantum dot based spin current injector. The device consists of a quantum dot that is strongly coupled to a ferromagnetic electrode on one side and weakly coupled to a nonmagnetic electrode on the other side. The presence of the ferromagnetic electrode results in an exchange field that splits the dot level. We show that this exchange-induced splitting can lead to almost full spin polarization of the current flowing through the device. Moreover, we also demonstrate that the sign of polarization can be changed by the gate or the bias voltage within a switching time in the nanosecond range. Thus, the proposed device can operate as an electrically controlled, rapidly switchable spin current source, which can be realized in various state-of-the-art nanostructures.

Graphical abstract: An electrically controlled quantum dot based spin current injector

Article information

Article type
Communication
Submitted
20 Feb 2012
Accepted
06 Apr 2012
First published
20 Apr 2012

Nanoscale, 2012,4, 3635-3639

An electrically controlled quantum dot based spin current injector

S. Csonka, I. Weymann and G. Zarand, Nanoscale, 2012, 4, 3635 DOI: 10.1039/C2NR30399J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements