Effect of electric field on the electronic structures of carbon nanotubes

Citation
C. Kim et al., Effect of electric field on the electronic structures of carbon nanotubes, APPL PHYS L, 79(8), 2001, pp. 1187-1189
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
8
Year of publication
2001
Pages
1187 - 1189
Database
ISI
SICI code
0003-6951(20010820)79:8<1187:EOEFOT>2.0.ZU;2-J
Abstract
We have investigated the electronic structures of a capped single-walled ca rbon nanotube under the applied electric field using density functional cal culations. The capped tube withstands field strengths up to 2 V/Angstrom. W hen the electric field is applied along the tube axis, charges are transfer red from the occupied levels localized at the top pentagon of the cap, and not from the highest occupied level localized at the side pentagon, to the unoccupied levels. We find that the charge densities at the top of the armc hair cap show two- or five-lobed patterns depending on the field strength, whereas those of the zigzag cap show a three-lobed pattern. The interpretat ion for the images of the field emission microscope is also discussed. (C) 2001 American Institute of Physics.