Spin polarization control through resonant states in an Fe/GaAs Schottky barrier

Details Spin polarization control through resonant states in an Fe/GaAs Schottky barrier Spin polarization control through resonant states in an Fe/GaAs Schottky barrier

2008-09-24

arxiv.org/abs/0809.4094v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.245316

Spin polarization of the tunnel conductivity has been studied for Fe/GaAs junctions with Schottky barriers. It is shown that band matching of resonant interface states within the Schottky barrier defines the sign of spin polarization of electrons transported through the barrier. The results account very well for experimental results including the tunneling of photo-excited electrons, and suggest that the spin polarization (from -100% to 100%) is dependent on the Schottky barrier height. They also suggest that the sign of the spin polarization can be controlled with a bias voltage.

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