Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.11: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster B

Probing Molecular Transport by Multiple Andreev Reflections — •David Weber and Elke Scheer — Universität Konstanz, Konstanz, Germany

The properties of molecular transport can be analyzed by measuring the conductance G or its derivatives, giving first insights to molecular levels and coupling to the electrodes [1]. Yet, the information of the intrinsic composition of conduction channels in a molecular contact is very limited. A Pt-H₂-Pt junction with a conductance of 1 G₀ was shown to accommodate indeed a single perfectly transmitted channel by measurements of the shot noise [2]. For Au-1,4-Benzenedithiol-Au junctions it has been proposed that despite of an enormous variability of G from 0.001 G₀ to almost 1 G₀, the transport would be maintained by a single channel [3]. We test this proposition by coupling the junction to superconducting leads and analyzing the non-linear current-voltage characteristics [4]. We present first results obtained with a low temperature Mechanically Controlled Break Junction setup.

[1] L. Zotti et al., Small 6, 1529-1535 (2010)

[2] R. H. M. Smit et al., Nature 419, 906-909 (2002)

[3] Y. Kim et al., Nano Lett. 11, 3734-3738 (2011)

[4] J. C. Cuevas et al., Phys. Rev. B 54, 7366-7379 (1996)