Electrostatics of straight and bent nanotubes

Details Electrostatics of straight and bent nanotubes Electrostatics of straight and bent nanotubes

2005-07-05

arxiv.org/abs/cond-mat/0507115v2

Phys. Rev. B 74, 155410 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures; final version, minor changes

Scientific paper

10.1103/PhysRevB.74.155410

Response of a single-walled carbon nanotube to external electric field, F, is calculated analytically within the classical electrostatics. Field-induced charge density distribution is approximately linear along the axis of metallic nanotube and depends rather weakly, as ln(h/r), on the nanotube length, h, (here r is the nanotube radius). In a semiconducting nanotube with a gap, E_g, charge separation occurs as F exceeds the threshold value F_{th}=E_g/eh. For F>F_{th}, positively and negatively charged regions at the ends of nanotube are separated by a neutral strip in the middle. For bent nanotubes the number of neutral strips can be one or two depending on the direction of F.

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