Abstract
We investigate the electronic transport properties of carbon nanotori
covalently connected to external electrodes made up of carbon nanotubes
of various chiralities. The study is based on computing ballistic
transport characteristics within the framework of Green's function
theory using a simple pi-orbital tight-binding model. The calculations
focus on the effect of the relative angle made by the electrodes as they
are placed at different positions along the nanoring. The conductance
behavior is found to depend on the details of the atomic structure of
the torus but also on the positions of the electrodes. Our findings are
rationalized using an elementary quantum mechanical interference model,
which reproduces well the main features of the numerical data.
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