Inelastic electron tunneling via molecular vibrations in single-molecule transistors

Abstract

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.

5 pages, 4 figures. Supplementary information available upon request

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• Kondo Physics in a Single Electron Transistor
• A Tunable Kondo Effect in Quantum Dots
• Excitation Spectra of Circular Few-Electron Quantum Dots
• The Kondo effect in C${}_{60}$ single-molecule transistors
• Electron Cotunneling in a Semiconductor Quantum Dot
• Inelastic current-voltage characteristics of atomic and molecular junctions
• Correlations between Ground and Excited State Spectra of a Quantum Dot

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