Mode-selective vibrational excitation induced by nonequilibrium transport processes in single-molecule junctions

Abstract

In a nanoscale molecular junction at finite bias voltage,the intra-molecular distribution of vibrational energy can strongly deviate from the thermal equilibrium distribution and specific vibrational modes can be selectively excited in a controllable way,regardless of the corresponding mode frequency. This is demonstrated for generic models of asymmetric molecular junctions with localized electronic states, employing a master equation as well as a nonequilibrium Green's function approach. It is shown that the applied bias voltage controls the excitation of specific vibrational modes coupled to these states, by tuning their electronic population,which influences the efficiency of vibrational cooling processes due to energy exchange with the leads.

12 pages, 4 figures, and Support Information

References in corpus (4)

• Franck-Condon blockade and giant Fano factors in transport through single molecules
• Resonant electron heating and molecular phonon cooling in single C${}_{60}$ junctions
• Theory of light-induced current in molecular-tunneling junctions excited with intense shaped pulses
• Mode-selective vibrational excitation induced by nonequilibrium transport processes in single-molecule junctions

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