Abstract
We predict and analyse a novel spin filter in semiconducting carbon nanotubes. By usinglocal electrostatic gates, the conduction and valence bands can be modulated to form adouble-barrier structure. The confined region below the valence band defines aZener quantum dot, which exhibits resonant tunnelling. The resonances splitin a magnetic field to make a bipolar spin filter for applications in spintronicsand quantum information processing. We model this using envelope function theory and show that this is in excellent agreement with acorresponding tight-binding calculation.
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