Abstract
We report a new type of nanomechanical resonator system based on one-dimensional chains of only 4 to 7 weakly coupled small molecules. Experimental characterization of the truly nanoscopic resonators is achieved by means of a novel radio-frequency scanning tunneling microscopy detection technique at cryogenic temperatures. Above 20 K we observe concerted oscillations of the individual molecules in chains, reminiscent of the first and second eigenmodes of a one-dimensional harmonic resonator. Radio-frequency scanning tunneling microscopy based frequency measurement reveals a characteristic length dependence of the oscillation frequency (between 51 and 127 MHz) in reasonable agreement with one-dimensional oscillator models. Our study demonstrates a new strategy for investigating and controlling the resonance properties of nanomechanical oscillators.
- Received 20 December 2013
DOI:https://doi.org/10.1103/PhysRevLett.112.117201
© 2014 American Physical Society
Viewpoint
Tuning in to the Smallest (Man-Made) Mechanical Resonator
Published 17 March 2014
Molecules self-assemble to form tiny oscillating cantilevers that could be used to sense single atoms or molecules.
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