Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-06-24
THE JOURNAL OF CHEMICAL PHYSICS 133, 081102, 2010
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 4 figures, and Support Information
Scientific paper
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.
Härtle Rainer
Peskin Uri
Thoss Michael
Volkovich Roie
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