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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology



Wednesday, 24 May 2006
(at 10:15 in room Phy 4.1.13)
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Dynamical symmetry breaking in transport through molecules

Andrea Donarini

Institut für Theoretische Physik
Universität Regensburg
   






We analyze the interplay between vibrational and electronic degrees of freedom in charge transport across a molecular single-electron transistor. We focus on the wide class of molecules which possess quasi-degenerate vibrational eigenstates, while no degeneracy occurs for their anionic configuration. We show that the combined effect of a thermal environment and coupling to leads, involving tunneling events charging and discharging the molecule, leads to a dynamical symmetry breaking where quasi-degenerate eigenstates acquire different occupations. This imbalance gives rise to a characteristic asymmetry of the current versus an applied gate voltage.



related paper (html)

Invited by J. Fabian (CQS + MC + QTD seminar)

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