Electronic transport through a single-wall carbon nanotube with a magnetic impurity

• Autor(a) principal: Lobo,T.
• Data de Publicação: 2006
• Outros Autores: Figueira,M. S., Ferreira,M. S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Journal of Physics
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000300045
• topic: Transport properties; Single-wall carbon nanotubes; Magnetic impurities

We are interested in studying the transport properties of metallic single-wall carbon nanotubes (SWCNTs) with isolated magnetic impurities. We consider a metallic zigzag SWCNT in the form of an infinitely long cylinder of diameter D, connected by two metallic electrodes under a bias voltage $E$, with a magnetic impurity located on its surface. To describe the Kondo resonance we employ an impurity version of the atomic model, previously developed to study the Kondo insulator properties in the lattice case. We calculate the approximate Green's functions of the impurity Anderson model by employing the exact solution of the atomic limit of the Anderson model, where we use the completeness condition to choose the position of the chemical potential. We consider the SWCNT Green's functions in a tight-binding approach. We calculate density of states curves that characterize well the structure of the Kondo peak and we also present the dependence of the conductance with the diameter of the SWCNT.