Abstract
The sp3 tight-binding model is used to calculate electronic structures of single-walled carbon nanotubes. The static dielectric function is evaluated from the random-phase approximation. strongly depends on the momentum (q) and angular momentum (L) transfer in the e e interactions. of L=1 at long wavelength limit represents the screening ability in the presence of a uniform transverse electric field. (q=0,L=1) mainly comes from the pπ electrons, but not the sp2σ electrons. The external field is greatly reduced. The dependence of (q=0,L=1) on the chiral angle, the nanotube radius, the magnetic flux, and the temperature is not strong. The transverse dielectric screening is largely enhanced by the increasing free carriers in conduction bands.
Original language | English |
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Article number | 193412 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 72 |
Issue number | 19 |
DOIs | |
Publication status | Published - 2005 Nov 15 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics