Electronic Transport of Two Benzene Rings Nano Molecular Bridge

An two-electrode molecular bridge model that consists of two benzene rings was presented. The characteristics of electronic transport through the nano-molecular bridge was investigated theoretically by using the tightbinding approach based on the Green’s function with only one π orbital per carbon atom at the site. Electronic transport probabilities through the molecular bridge from the input to the output terminal were obtained. The electronic current distributions inside the molecular bridge were calculated and shown in graphical analogy by the current density method based on Fisher-Lee formula at the energy points E=±0.68 and E=±1.38 where the peaks of transport probabilities appeared, and the maximum bond electronic current was also presented. The reason why the loop current in the benzene ring is induced by the phase difference within the molecular orbits is explained.