A tunneling system with a molecule between the leads was analyzed in the framework of the adiabatic approach. The adiabatic approach allowed us to consider effects of equilibrium ion positions changing and vibrational mode frequency modification due to the electrons tunneling through the molecule localized states. It was demonstrated that vibrational states become squeezed if the tunneling current flows through the molecule. The mean-square displacement of the molecule and the degree of squeezing depend on the system parameters and could be tuned by applied bias voltage. Obtained results demonstrate the possibility of molecule ions' effective “freezing” by the tunneling current.

• Received 20 March 2019
• Revised 2 June 2019

DOI:https://doi.org/10.1103/PhysRevB.100.035307