Mathematical Trick (IMAGE)
Caption
A mathematical trick -- an image showing the energy levels of surface electrons in reciprocal space -- reveals the area of maximum energy efficiency. This is found where the points of the double cones lie at the so-called Fermi level (grey band, middle double cone), and indicates the highest energy level that an electron can possess in the material under investigation with no outside energy supply. By varying the layer thickness, the cones can be altered and with them the conditions for spin transport. The red band symbolizes the conduction band, the green one, the valence band.
Credit
Forschungszentrum Jülich
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