Electron Transport through Three-terminal C_(60) Molecular Bridge

摘要

The quantum transmission characteristic of three-terminal C_(60) molecular bridge is investigated theoretically by using Green's function approach based on tight-binding theory with only one jr orbital per carbon atom inside C_(60) molecule. The transmission spectra that electrons transport through the C_(60) molecular bridge from one terminal to the other two terminals are obtained. The electronic current distributions inside the molecular bridge are calculated and shown in graphical analogy by the current density method based on Fisher-Lee formula at the energy points E=±0.42, ±1.06 and ±1.5, respectively, where the transmission probabilities appear peaks. We found that the transmission spectra are related to the incident electronic energy, and depend on C_(60) molecular levels strongly. We also found that the electrons transport through the C_(60) molecular bridge symmetrically, and the multi-point switching properties depend on the energy. That the current distributions in the C_(60) molecular bridge agree well with Kirchhoff quantum current momentum conservation law is shown.