Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Postersession Transport: Nanoelectronics, Quantum Coherence and Quantum Information, Fluctuations and Noise

TT 35.26: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Charge transport through an interference SET — •Georg Begemann, Dana Darau, Andrea Donarini, and Milena Grifoni — University of Regensburg, Germany

We study the charge transport through a benzene interference single electron transistor. The interplay between Coulomb interaction and orbital symmetry produces specific transport characteristics that can be considered as the fingerprints of the contacted molecule. Specifically we predict selective conductance suppression and the appearance of negative differential conductance and current blocking when changing the contacts from para to meta configuration[1,2]. All effects originate from destructive interference in transport involving states with orbital degeneracy.

The studied transport phenomena are also robust under the perturbation exerted by the anchor groups binding the contact atoms to the leads or by an external electrostatic field.

[1] G.Begemann, D.Darau, A.Donarini, and M.Grifoni, Phys. Rev. B 77, 201406(R) (2008).

[2] D.Darau, G.Begemann, A.Donarini, M.Grifoni, arXiv:0810.2461