Effect of electric field on the electronic structures of carbon nanotubes

Kim, C Kim, B Lee, SM Jo, C Lee, YH

C. Kim et al., Effect of electric field on the electronic structures of carbon nanotubes, APPL PHYS L, 79(8), 2001, pp. 1187-1189

10

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science

APPLIED PHYSICS LETTERS

0003-6951 → ACNP

79

8

2001

1187 - 1189

ISI

0003-6951(20010820)79:8<1187:EOEFOT>2.0.ZU;2-J

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.