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The role of vibrations in single‐molecule charge transport: A case study of oligoynes with pyridine anchor groups
Author(s) -
Ballmann Stefan,
Hieringer Wolfgang,
Härtle Rainer,
Coto Pedro B.,
Bryce Martin R.,
Görling Andreas,
Thoss Michael,
Weber Heiko B.
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201350025
Subject(s) - molecule , molecular vibration , molecular wire , pyridine , conductance , chemistry , charge (physics) , spectral line , molecular physics , density functional theory , chemical physics , computational chemistry , physics , condensed matter physics , quantum mechanics , organic chemistry , medicinal chemistry
We report on measurements on molecular wires in single‐molecule junctions. The target is to identify vibrational signatures in the differential conductance spectra, which cannot be resolved for most molecular wires in the resonant transport regime. For the given molecules, we find indeed vibrational sidepeaks, which can be assigned to the longitudinal modes of the string‐like central motif of the molecule by comparison with density functional theory. These data corroborate that oligoyne wires are ideally suited for characterizing vibrational sidepeaks. A current increase as a consequence of vibrational decoherence observed for thiols is, however, not found due to the pyridine anchor group chosen in the present molecules.