Electron-vibration interaction in single-molecule junctions: from contact to tunneling regimes.
Point contact spectroscopy on a H(2)O molecule bridging Pt electrodes reveals a clear crossover between enhancement and reduction of the conductance due to electron-vibration interaction. As single-channel models predict such a crossover at a transmission probability of tau=0.5, we used shot noise measurements to analyze the transmission and observed at least two channels across the junction where the dominant channel has a tau=0.51 +/- 0.01 transmission probability at the crossover conductance, which is consistent with the predictions for single-channel models.
Kamerlingh Onnes Laboratory, Leiden University, Leiden, The Netherlands.
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Tal
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Krieger
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Leerink
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van Ruitenbeek