Local Non-Fermi Liquid Theory of Magnetic Impurity Effects in Carbon Nanotubes

TL;DR

This paper develops a local non-Fermi liquid theory for magnetic impurity effects in carbon nanotubes, revealing unique low-temperature behaviors such as a pseudo gap and specific temperature dependencies in resistivity and susceptibilities.

Contribution

It introduces a theoretical framework for understanding multi-channel Kondo effects and non-Fermi liquid behavior in metallic carbon nanotubes at low temperatures.

Findings

Density of states exhibits a |omega|^1/2 singularity

Resistivity scales as T^1/2 at low temperatures

Dynamical susceptibilities follow |omega|^1/2 dependence

Abstract

Magnetic impurity effects in carbon nanotubes are studied theoretically. The multi channel Kondo effect is investigated with the band structure of the metallic nanotubes. The local non-Fermi liquid behavior is realized at temperatures lower than the Kondo temperature T_K. The density of states of localized electron has a singularity |omega|^1/2 which gives rise to a pseudo gap at the Kondo resonance in low temperatures. The temperature dependence of the electronic resistivity is predicted as T^1/2, and the imaginary part of dynamical susceptibilities has the |omega|^1/2 dependence.