Zener quantum dot spin filter in a carbon nanotube

Details Zener quantum dot spin filter in a carbon nanotube Zener quantum dot spin filter in a carbon nanotube

2004-12-15

arxiv.org/abs/cond-mat/0412406v2

J. Phys.: Condens. Matter 18 (2006) S843-S849

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages latex, 5 eps figs. Accepted to J. Phys. Cond. Mat

Scientific paper

10.1088/0953-8984/18/21/S10

We predict and analyze 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 tunneling. 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.

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