The interaction and tunneling conductance between oppositely located ends ofcoaxial carbon nanotubes are studied by the example of two (11,11) nanotubeswith open ends terminated by hydrogen atoms. The Green function formalism isapplied to determine the tunneling current through the nanotube ends as afunction of the distance between the ends, relative orientation of thenanotubes and voltage applied. The energy favorable configuration of thecoaxial nanotubes is obtained by the analysis of their interaction energy atdifferent distances between the nanotube ends and angles of their relativerotation. Using these calculations, a general scheme of the force sensor basedon the interaction between ends of coaxial nanotubes is proposed and therelation between the tunneling conductance and measured force is establishedfor the considered nanotubes. The operational characteristics of this device asa magnetic field sensor based on measurements of the magnetic force acting onthe coaxial nanotubes filled with magnetic endofullerenes are estimated.
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