Theory of a Magnetically-Controlled Quantum-Dot Spin Transistor

Details Theory of a Magnetically-Controlled Quantum-Dot Spin Transistor Theory of a Magnetically-Controlled Quantum-Dot Spin Transistor

2007-05-04

arxiv.org/abs/0705.0648v2

Phys. Rev. B 76, 125306 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.76.125306

We examine transport through a quantum dot coupled to three ferromagnetic leads in the regime of weak tunnel coupling. A finite source-drain voltage generates a nonequilibrium spin on the otherwise non-magnetic quantum dot. This spin accumulation leads to magnetoresistance. A ferromagnetic but current-free base electrode influences the quantum-dot spin via incoherent spin-flip processes and coherent spin precession. As the dot spin determines the conductance of the device, this allows for a purely magnetic transistor-like operation. We analyze the effect of both types of processes on the electric current in different geometries.

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