Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Transport: Poster Session
TT 58.27: Poster
Mittwoch, 9. März 2016, 15:00–18:30, Poster D
shot noise of 1,4-benzenedithiol single-molecule junctions — •Amin Karimi1, Safa Golrokh1, Markus Herz1, Ryoma Hayakawa1,2, Fabian Pauly1, and Elke Scheer1 — 1Department of Physics, University of Konstanz, Konstanz, Germany — 2Advanced Electronic Materials Center, National Institute for Materials Science, Namiki, Tsukuba, Japan
Shot noise measurements represent an important tool to characterize quantum transport through nanoscale junctions [1,2]. However, noise measurements are difficult since extrinsic noise sources have to be carefully discarded from the intrinsic signal. We present here a much simpler experimental technique compared to established methods that is operational over several orders of magnitude of conductance and noise. It does not impose additional requirements on the measurement wiring and uses solely commercially available electronics. The performance of the system is tested by investigation of established gold single-atom contacts. We then apply the novel method to single-molecule contacts of benzenedithiol (BDT) between Au electrodes. Our study hence reports that Au-BDT-Au is a molecular junction with a widely tunable conductance. It represents the conceptually simplest quantum system, namely a single channel, quantum coherent junction.
[1] D.Djukic, J. M. van Ruitenbeek, Nano Lett. 6, 789 (2006)
[2] O. Tal, M. Krieger, B. Leerink, J. M. van Ruitenbeek,
PRL 100, 196804 (2008)