Ballistic transport and electrostatics in metallic carbon nanotubes

We calculate the current and electrostatic potential drop in metallic carbon nanotube wires self-consistently by solving the Green's function and electrostatics equations in the ballistic case. About one-tenth of the applied voltage drops across the bulk of a nanowire, independent of the length...

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Bibliographic Details
Published in:IEEE transactions on nanotechnology 2005-09, Vol.4 (5), p.557-562
Main Authors: Svizhenko, A., Anantram, M.P., Govindan, T.R.
Format: Article
Language:English
Subjects:
Ballistic transport
Bias
Carbon nanotubes
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductance
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
Electrostatics
Exact sciences and technology
Green's function methods
inter-connects
Mathematical analysis
modeling
Nanocomposites
Nanomaterials
Nanostructure
Nanotubes
nanowires
Nonlinear equations
Physics
Temperature
Tunneling
Voltage
Wires
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Summary:We calculate the current and electrostatic potential drop in metallic carbon nanotube wires self-consistently by solving the Green's function and electrostatics equations in the ballistic case. About one-tenth of the applied voltage drops across the bulk of a nanowire, independent of the lengths considered here. The remaining nine-tenths of the bias drops near the contacts, thereby creating a nonlinear potential drop. The scaling of the electric field at the center of the nanotube with length (L) is faster than 1/L (roughly 1/L/sup 1.25-1.75/). At room temperature, the low bias conductance of larger-diameter nanotubes is larger than 4e/sup 2//h due to occupation of noncrossing subbands. The physics of conductance evolution with bias due to Zener tunneling in noncrossing subbands is discussed.
ISSN:1536-125X
1941-0085
DOI:10.1109/TNANO.2005.851409