Tunnel Electron Current Dependence on Voltage in Molecular Bridge

A theory is developed for the tunnel electron current j in the trimolecular two-junction system L--C--R. The analytical expressions for J as a function of the potential difference (V 1 — V 2) across the system and molecular parameters are derived in the limits of highly asymmetrical L--C--R system and low (V 1 — V 2) values. These expressions and numerical results reflect nonlinear charge transfer effects in the three-body system. A possible application of the two-junction system as an element of the molecular triode is discussed.