Quantum Transmission and Current Distribution of C60Molecule Bridge with Near-, Far-terminal Electrodes

The quantum transmission characteristic of a C60molecular bridge with near- and far-terminal electrodes is investigated theoretically by using Green´s function approach based on tight-binding theory, in which only one π orbital is considered per carbon atom inside a C60molecule. The transmission spectra for electrons through the C60molecular bridge from an input terminal to two output terminals have been obtained. The quantum current distributions inside the molecular bridge are calculated by the current density method based on the Fisher-Lee formula at the energy points E=-1.36eV and +1.59eV, respectively, where the transmission probabilities appear as peaks. We found that the transmission spectra are related to the incident electronic energy and depend on C60molecular levels strongly. We also found that the multi-point switching properties of C60molecular bridge depend on the energy of the electrons transmitted through the C60molecule. Agreement of the quantum current distributions in the C60molecular bridge with Kirchhoff quantum current momentum conservation law is explained.