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Zener quantum dot spin filter in a carbon nanotube

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>31/05/2006
<mark>Journal</mark>Journal of Physics: Condensed Matter
Issue number21
Number of pages7
Pages (from-to)S843-S849
Publication StatusPublished
<mark>Original language</mark>English


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) over right arrow . (p) over right arrow envelope function theory and show that this is in excellent agreement with a corresponding tight-binding calculation.