Kondo impurities in nanotubes: the importance of being "in"

Abstract

Transition metal impurities will yield zero bias anomalies in the conductance of well contacted metallic carbon nanotubes, but Kondo temperatures and geometry dependences have not been anticipated so far. Applying the density functional plus numerical renormalization group approach of Lucignano \textit{et al.} to Co and Fe impurities in (4,4) and (8,8) nanotubes, we discover a huge difference of behaviour between outside versus inside adsorption of the impurity. The predicted Kondo temperatures and zero bias anomalies, tiny outside the nanotube, turn large and strongly radius dependent inside, owing to a change of symmetry of the magnetic orbital. Observation of this Kondo effect should open the way to a host of future experiments.

References in corpus (3)

• The numerical renormalization group method for quantum impurity systems
• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Kondo effect in single atom contacts: the importance of the atomic geometry

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• Co adatoms on Cu surfaces: ballistic conductance and Kondo temperature
• Strong correlation effects in theoretical STM studies of magnetic adatoms
• Model Hamiltonian for strongly-correlated systems: Systematic, self-consistent, and unique construction
• From density functional to Kondo: magnetic impurities in nanotubes
• Kondo Phase Transitions of Magnetic Impurities in Carbon Nanotubes