Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.30: Poster

Freitag, 4. März 2005, 14:00–18:00, Poster TU C

Discrete low-bias conductance fluctuations in molecular break-junctions — •Jan U. Würfel, Mark Elbing, Marcel Mayor, and Heiko B. Weber — Institut für Nanotechnologie, FZ Karlsruhe

We investigate the electronic transport properties of gold-molecule-gold junctions using the mechanically-controllable break-junction (MCBJ) technique. We have shown in former studies that under certain conditions single-molecule contacts could be achieved [1]. Here, we study the longterm stability (up to days) of stable and reproducible contacts, which show discrete transitions in the conductance at low bias (∼ 10 mV). Some of the conductance values could be identified as integer multiples of a fixed value. This may suggest an integer number of molecules contributing. The findings are discussed.

[1] Phys. Rev. Lett., 88, 176804 (2002)