Research output: Contribution to journal › Journal article
|<mark>Journal publication date</mark>||31/05/2006|
|<mark>Journal</mark>||Journal of Physics: Condensed Matter|
|Number of pages||7|
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.