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Issue 12, 2012
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An electrically controlled quantum dot based spin current injector

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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

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Publication details

The article was received on 20 Feb 2012, accepted on 06 Apr 2012 and first published on 20 Apr 2012


Article type: Communication
DOI: 10.1039/C2NR30399J
Citation: Nanoscale, 2012,4, 3635-3639
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    An electrically controlled quantum dot based spin current injector

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

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