Abstract
The electric current of $$Cr_8$$Cr8 and $$Cr_7Ni$$Cr7Ni molecular rings with two semi-infinite, $$Au$$Au leads have been investigated. We have performed numerical calculations using the non-equilibrium Green's function method combined with the density functional theory. Then the electric current under a given applied bias voltage has been obtained in a two terminal molecular circuit system. Transport characteristics of these molecular-based quantum rings and coherent transport features of the system have been studied. It was shown that negative differential conductance regime arises, in several ranges of the bias voltage.
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