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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Friday, 12 March 2004
(at 10:45 in room H1)
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Electronic transport through single molecules

H. v. Löhneysen

Universität Karlsruhe

Electronic transport measurements through single p -conjugated molecules can be realized using mechanically controlled break junctions to couple thiol end groups of the molecules to two gold electrodes. We have investigated transport through face=symbol>p-conjugated molecules which differ by their spatial symmetry and p-conjugated connectivity. The current voltage characteristics (IVs) of the metal-molecule-metal system reflect the spatial symmetry and topology of the molecules with respect to the direction of current flow indicating that transport occurs indeed through single molecules [1]. Fluctuations in the IVs are a manifestation of the variation of level spacings of the system, which depend crucially on the bonding between thiol end groups and Au electrodes.

For the future electronics, carbon nanotubes are the prime candidates. Recent progress in the controlled deposition of nanotubes between electrodes and separation of metallic and semiconducting nanotubes [2] is reported.

[1] J. Reichert et al., Phys. Rev. Lett. 88, 176804 (2002)

[2] R. Krupke et al., Science 301, 344 (2003)

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Within the DPG Frühjahrstagung 2004 (German Physical Society, Spring Meeting 2004)

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