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Vibrationally induced two-level systems in single-molecule junctions

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PHYSICAL REVIEW LETTERS
卷 97, 期 22, 页码 -

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AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.97.226806

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Single-molecule junctions are found to show anomalous spikes in dI/dV spectra. The position in energy of the spikes is related to local vibration mode energies. A model of vibrationally induced two-level systems reproduces the data very well. This mechanism is expected to be quite general for single-molecule junctions. It acts as an intrinsic amplification mechanism for local vibration mode features and may be exploited as a new spectroscopic tool.

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