Title: Impurity screening in carbon nanotubes
Authors: Lin, MF
Chuu, DS
National Chiao Tung University
Department of Electrophysics
Issue Date: 15-Aug-1997
Abstract: Nanotube geometry determines electronic structure and thus impurity screening. A metallic carbon nanotube could effectively screen a charged impurity, while a semiconducting carbon nanotube could not. The ability to screen a long-range Coulomb field is mainly determined by whether there are: Free carriers in the subbands nearest the Fermi level. The detailed screening propel-ties are sensitive to the impurity position, and the tubular structure (such as radius and chiral angle). Strong, short-wavelength Friedel oscillations at long distances are found to exist only in metallic armchair nanotubes. They are relatively obvious for a smaller armchair nanotube, and could survive at room temperature.
URI: http://hdl.handle.net/11536/368
ISSN: 0163-1829
Volume: 56
Issue: 8
Begin Page: 4996
End Page: 5002
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