Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-07-31
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
accepted to Nature
Scientific paper
10.1038/nature05037
The conductance of a single metal-molecule-metal junction depends critically on the conformations of the molecule. In the simple case of a biphenyl, two phenyl rings linked together by a single C-C bond, the conductance is expected to depend on the relative twist angle between the two rings, with the planar conformation having the highest conductance. A number of different techniques have measured the conductance of metal-molecule(s)-metal junctions. However, the conductance variation from junction to junction has made it difficult to verify even the simplest predictions about how molecules should behave in unimolecular devices. Here, using amine link groups to form single molecule junctions, we show a clear correlation between molecule conformation and junction conductance in a series of seven biphenyl molecules with different ring substitutions that alter the twist angle of the molecules. We find that the conductance for the series decreases with increasing twist angle, consistent with a cosine squared relation predicted theoretically for transport through pi-conjugated systems.
Hybertsen Mark S.
Klare Jennifer E.
Nuckolls Colin
Steigerwald Michael L.
Venkataraman Latha
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