Electronic structure model of a metal-filled carbon nanotube

Carbon monolayer nanotubes filled with K, Rb, and Cs atoms, in which every ten carbon atoms captures an electron from the doping atoms, are considered . It is assumed that a positive charge in the bulk of the nanotube and a ne gative charge on its surface are distributed uniformly so that the potentia l energy of a conduction electron inside the nanotube is proportional to th e square of the distance to its center. The dependences of the Fermi quasi- momentum for conduction electrons inside the nanotube on their volume densi ty and the tube radius are obtained in the one-electron approximation for a n arbitrary number of subbands of transverse motion. The Landauer formula i s used for calculating the dependence of the conductivity of the metallic s ubsystem of the nanotube on its radius. (C) 2000 MAIK "Nauka/Interperiodica ".