Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 12: Mesoskopische Systeme II

TT 12.5: Vortrag

Mittwoch, 26. März 2003, 15:45–16:00, HSZ03

Electron transfer in single molecule junctions — •Heiko B. Weber, Michelle Di Leo, Joachim Reichert, Marcel Mayor, and Mark Elbing — Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Postfach 3640, D-76021 Karlsruhe

It has been demonstrated recently that the break-junction technique can be used to establish single-molecule conductance measurements with conjugated molecules [1]. Here, we focus on a class of molecules, where the conjugated part is divided into several sections. Hence, the electronic conduction process corresponds to subsequent tunneling along a series of conjugated sites (benzene rings). The conductance measurements show qualitative differences of the IVs for the four molecules which are attributed to different topology: while the molecules with 1,3, and 4 rings enclose conjugated islands and show Coulomb-blockade-like IVs, the molecule with 2 benzene units has a single barrier in its center and shows no blockade region.

[1] J. Reichert, R. Ochs, D. Beckmann, H. B. Weber, M. Mayor, H. v. Löhneysen, Phys. Rev. Lett. 88 (2002) 176804.