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Molecular Wires in Single-Molecule Junctions: Charge Transport and Vibrational Excitations

Authors

  • Stefan Ballmann,

    1. Chair of Applied Physics, University of Erlangen-Nürnberg, Staudtstr. 7/Bau A3, 91058 Erlangen (Germany), Fax: (+49) 9131-8528423
    2. Chair of Theoretical Chemistry, University of Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen (Germany)
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  • Wolfgang Hieringer Dr.,

    1. Chair of Theoretical Chemistry, University of Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen (Germany)
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  • Daniel Secker Dr.,

    1. Chair of Applied Physics, University of Erlangen-Nürnberg, Staudtstr. 7/Bau A3, 91058 Erlangen (Germany), Fax: (+49) 9131-8528423
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  • Qinglin Zheng,

    1. Institute of Organic Chemistry, University of Erlangen-Nürnberg, Henkestr. 42, 91054 Erlangen (Germany)
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  • John A. Gladysz Prof.,

    1. Department of Chemistry, Texas A& M University, PO Box 30012, College Station, Texas 77843-3012 (USA)
    2. Institute of Organic Chemistry, University of Erlangen-Nürnberg, Henkestr. 42, 91054 Erlangen (Germany)
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  • Andreas Görling Prof.,

    1. Chair of Theoretical Chemistry, University of Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen (Germany)
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  • Heiko B. Weber Prof.

    1. Chair of Applied Physics, University of Erlangen-Nürnberg, Staudtstr. 7/Bau A3, 91058 Erlangen (Germany), Fax: (+49) 9131-8528423
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Abstract

We investigate the effect of vibrations on the electronic transport through single-molecule junctions, using the mechanically controlled break junction technique. The molecules under investigation are oligoyne chains with appropriate end groups, which represent both an ideally linear electrical wire and an ideal molecular vibrating string. Vibronic features can be detected as satellites to the electronic transitions, which are assigned to longitudinal modes of the string by comparison with density functional theory data.

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