Journal
PHYSICAL REVIEW B
Volume 93, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.115421
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Funding
- German-Israeli Foundation for Scientific Development (GIF)
- Deutsche Forschungsgemeinschaft (DFG) through the DFG-Cluster of Excellence 'Engineering of Advanced Materials' [SFB 953]
- Alexander von Humdoldt foundation via a Feodor-Lynen research fellowship
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We investigate the role of electronic-vibrational coupling in resonant electron transport through single-molecule junctions, taking into account that the corresponding coupling strengths may depend on the charge and excitation state of the molecular bridge. Within an effective-model Hamiltonian approach for a molecule with multiple electronic states, this requires to extend the commonly used model and include vibrationally dependent electron-electron interaction. We use Born-Markov master equation methods and consider selected models to exemplify the effect of the additional interaction on the transport characteristics of a single-molecule junction. In particular, we show that it has a significant influence on local cooling and heating mechanisms, it may result in negative differential resistance, and it may cause pronounced asymmetries in the conductance map of a single-molecule junction.
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