Bandstructure modulation for carbon nanotubes in a uniform electric field
- 28 January 2002
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 80 (4), 676-678
- https://doi.org/10.1063/1.1432441
Abstract
A method to electronically modulate the energy gap and bandstructure of semiconducting carbon nanotubes is proposed. We investigate this bandstructure modulation mechanism using tight-binding and density functional theory (DFT). Results show that the energy gap of a semiconducting nanotube can be narrowed, when the tube is placed in an electric field perpendicular to the tube axis. In contrast, Metallic tubes were found to exhibit a screening behavior, whereby free charge redistributes about the tube circumference as a result of the external field. In this case, the bandstructure shows little perturbation in response to an applied electric field.Keywords
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