Magnetic impurity effects in metallic carbon nanotubes: local non-Fermi liquid theory

TL;DR

This paper investigates the effects of magnetic impurities on metallic carbon nanotubes, revealing non-Fermi liquid behavior characterized by singularities in the density of states and specific temperature dependencies.

Contribution

It applies the resolvent method to the multi-channel Kondo effect in nanotubes, highlighting local non-Fermi liquid phenomena at low temperatures.

Findings

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

Resistivity scales as T^1/2 at low temperatures

Dynamical susceptibilities show |omega|^1/2 dependence

Abstract

Magnetic impurity effects on metallic carbon nanotubes are studied theoretically. The resolvent method for the multi channel Kondo effect is applied to the band structure of the kp perturbation hamiltonian in the limit of the infinite onsite repulsion at the impurity site. We discuss the local non-Fermi liquid behavior 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. Possible experimental observations are discussed.