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LETTER TO THE EDITOR Zener quantum dot spin filter in a carbon nanotube

By D Gunlycke, J H Jefferson, S W D Bailey, C J Lambert, D G Pettifor and G A D Briggs


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

Year: 2006
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