Negative differential conductance in chromium based nano rings
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The electric current of \(Cr_8\) and \(Cr_7Ni\) molecular rings with two semi-infinite, \(Au\) 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.