Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: TR: Nanoelectronics III: Molecular Electronics 1

TT 35.4: Talk

Thursday, March 25, 2010, 14:45–15:00, H21

Conductance Through a Redox System in the Coulomb Blockade Regime: Many-Particle Effects and Influence of Electronic Correlations — •Sabine Tornow and Gertrud Zwicknagl — Institut fuer Mathematische Physik, TU Braunschweig, 38106 Braunschweig, Germany

We investigate the transport characteristics of a redox system weakly coupled to leads in the Coulomb blockade regime. The redox system comprises a donor and acceptor separated by an insulating bridge in a solution. It is modeled by a two-site extended Hubbard model which includes on-site and inter-site Coulomb interactions and the coupling to a bosonic bath. The current voltage characteristics is calculated at high temperatures using a rate equation approach. For high voltages exceeding the Coulomb repulsion at the donor site the calculated transport characteristics exhibit pronounced deviations from the behavior expected from single-electron transport. Depending on the relative sizes of the effective on-site and inter-site Coulomb interactions on one side and the reorganization energy on the other side we find negative differential resistance or current enhancement.