Electron-electron interaction in carbon nanostructures

TL;DR

This paper introduces a new method to measure electron-electron interactions in various carbon nanostructures, revealing how curvature influences interaction strength across different materials.

Contribution

A novel technique for determining the electron-electron interaction constant in carbon nanostructures using quantum corrections to magnetic properties.

Findings

$\lambda_c$=0.2 for arc-MWNTs

$\lambda_c$=0.1 for pyrolytic graphite

$\lambda_c$>0 for catalytic MWNTs

Abstract

The electron-electron interaction in carbon nanostructures was studied. A new method which allows to determine the electron-electron interaction constant $\lambda_c$ from the analysis of quantum correction to the magnetic susceptibility and the magnetoresistance was developed. Three types of carbon materials: arc-produced multiwalled carbon nanotubes (arc-MWNTs), CVD-produced catalytic multiwalled carbon nanotubes (c-MWNTs) and pyrolytic carbon were used for investigation. We found that $\lambda_c$=0.2 for arc-MWNTs (before and after bromination treatment); $\lambda_c$ = 0.1 for pyrolytic graphite; $\lambda_c >$ 0 for c-MWNTs. We conclude that the curvature of graphene layers in carbon nanostructures leads to the increase of the electron-electron interaction constant $\lambda_c$.