Many-Body Effects in Finite Metallic Carbon Nanotubes

Disorder effects and electronic conductance in metallic carbon nanotubes

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...

Intraband and intersubband many-body effects in the nonlinear optical response of single-wall carbon nanotubes

Final Report : Spectroscopy of Many - Body Effects in Carbon Nanotubes Report

The goal of this research project was to explore the fundamental properties of degenerate one-dimensional (1-D) electrons in single-walled carbon nanotubes (SWNTs) using dynamical methods to probe and understand electronic correlations and many-body phenomena. We studied two aspects of 1-D electron correlations in SWNTs: Fermi-edge singularities (FES) and conduction electron spin resonance (ESR...

Many-body effects in semiconducting single-wall silicon nanotubes

The electronic and optical properties of semiconducting silicon nanotubes (SiNTs) are studied by means of the many-body Green's function method, i.e., GW approximation and Bethe-Salpeter equation. In these studied structures, i.e., (4,4), (6,6) and (10,0) SiNTs, self-energy effects are enhanced giving rise to large quasi-particle (QP) band gaps due to the confinement effect. The strong electron...

Electrical switching in metallic carbon nanotubes.

We present first-principles calculations of quantum transport which show that the resistance of metallic carbon nanotubes can be changed dramatically with homogeneous transverse electric fields if the nanotubes have impurities or defects. The change of the resistance is predicted to range over more than 2 orders of magnitude with experimentally attainable electric fields. This novel property ha...