Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-03-31
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1109/TNANO.2005.851409
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 non linear potential drop. The scaling of the electric field at the center of the nanotube with length (L) is faster than 1/L (roughly $1/L^{1.25-1.75}$). At room temperature, the low bias conductance of large diameter nanotubes is larger than $4e^2/h$ due to occupation of non crossing subbands. The physics of conductance evolution with bias due to the transmission Zener tunneling in non crossing subbands is discussed.
Anantram M. P.
Govindan T. R.
Svizhenko Alexei
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