P408
Disorder effects and electronic conductance
in metallic carbon nanotubes
Kikuo Harigaya
NIMC, ETL, and Kanazawa Institute of Technology
Disorder effects on density of states and electronic
conduction in metallic carbon nanotubes are analyzed
by a tight binding model with Gaussian bond disorder.
Metallic armchair and zigzag nanotubes are considered.
We obtain a conductance which becomes smaller by the
factor of the inverse of a few from that of the clean
nanotube. This decrease mainly comes from lattice
fluctuations of the width which is comparable to thermal
fluctuations. We also find that suppression of
electonic conductance around the Fermi energy due to
disorder is smaller than that of the inner valence
(and conduction) band states. This is due to the extended
nature of electronic states around the Fermi energy
between the valence and conduction bands. Such property
is typical to electronic structures of metallic carbon
nanotubes.
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