Vibrationally Induced Two-Level Systems in Single-Molecule Junctions
W. H. A. Thijssen, D. Djukic, A. F. Otte, R. H. Bremmer, J. M. van Ruitenbeek
Abstract
Single-molecule junctions are found to show anomalous spikes in dI/dV spectra. The position in energy of the spikes are 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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