Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.30: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Large shot noise levels in single-molecule junctions due to electronic-vibrational coupling — •Christian Schinabeck, Rainer Härtle, and Michael Thoss — Institut für Theoreti-sche Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany

We investigate shot noise in transport through single-molecule junctions using a master equation approach that is based on a second order expansion in the molecule-lead coupling [1]. Recently, large shot noise levels have been reported for a variety of single-molecule junctions with different molecular species [2]. This indicates that electrons are tunneling through these contacts in avalanches rather than in statistically uncorrelated tunneling events. Such a transport behaviour was found by Koch et al. for a model comprising a single electronic state that is very strongly coupled to a single vibrational mode [3]. In this contribution, we show that a weak to moderate coupling of the electrons to a multitude of vibrational modes may also give rise to large shot noise levels, as observed in experiments [2].

[1] C. Flindt et al., Physica E 29, 411-418 (2005).

[2] D. Secker et al., Phys. Rev. Lett. 106, 136807 (2011).

[3] J. Koch et al., Phys. Rev. B 74, 205438 (2006).