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Physical Review Letters



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American Physical Society


In single-molecule transistors, we observe inelastic cotunneling features that correspond energetically to vibrational excitations of the molecule, as determined by Raman and infrared spectroscopy. This is a form of inelastic electron tunneling spectroscopy of single molecules, with the transistor geometry allowing in situ tuning of the electronic states via a gate electrode. The vibrational features shift and change shape as the electronic levels are tuned near resonance, indicating significant modification of the vibrational states. When the molecule contains an unpaired electron, we also observe vibrational satellite features around the Kondo resonance.


Author Posting. © American Physical Society, 2004. This article is posted here by permission of the American Physical Society for personal use, not for redistribution. The article was published in Physical Review Letters, Volume 93, December 2004,

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