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TT: Fachverband Tiefe Temperaturen

TT 32: Transport: Nanoelectronics III - Molecular Electronics 1

TT 32.6: Vortrag

Mittwoch, 28. März 2012, 16:30–16:45, BH 334

Coulomb blockade in molecular junctions with intermediate coupling to the leads — •Dmitry Ryndyk, Andrea Donarini, Milena Grifoni, and Klaus Richter — Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany

An ab initio based theoretical approach to describe nonequilibrium many-body effects in molecular transport is developed. In particular, an Anderson-Hubbard cluster model on the basis of localized molecular orbitals is derived for single-molecule junctions with intermediate coupling to the leads. As an example we consider the Coulomb blockade in a benzenedithiol junction with gold electrodes. An effective few-level model is obtained, transformed into the many-body eigenstate basis and solved within the master equation approach. It is shown that transport through asymmetrically coupled molecular edge states results in strongly suppressed peaks of the differential conductance at small voltage.