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

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Abstract
Magnetic impurity effects on metallic carbon nanotubes are studied theoretically. The resolvent method for the multichannel Kondo effect is applied to the band structure of the k p perturbation Hamiltonian in the limit of infinite onsite repulsion at the impurity site. We discuss the local non-Fermi liquid behaviour at temperatures below the Kondo temperature TK. The density of states of localized electrons has a singularity at about |ω|1/2, which gives rise to a pseudogap at the Kondo resonance at low temperatures. The temperature dependence of the electronic resistivity is predicted to be T 1/2, and the imaginary part of the dynamical susceptibilities is dependent on |ω|1/2. Possible experimental observations are discussed.