Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 33: Transport - Nanoelectronics III: Molecular Electronics

TT 33.7: Vortrag

Dienstag, 8. März 2005, 15:30–15:45, TU H3027

Vibrational effects in transport through a few level molecule. — •Dmitri Ryndyk — Universität Regensburg

We consider a simple molecule with several electron levels placed between large metallic leads. At finite voltage internal vibrations of the molecule as well as an oscillation of the whole molecule between the leads can be excited. We use the self-consistent nonequilibrium theory to describe electron transport through a molecule and dynamics of vibrations. At small voltage or high temperature current is affected by thermally excited vibrations. At larger voltage and low enough temperature transition into the regime with nonequilibrium vibrations is possible. Phase diagram of the system is controlled by coupling to the leads, electron-vibron coupling, and coupling of vibrations to the thermal bath. The other nonequilibrium effect which should be taken into account is spectrum modification due to nonequilibrium distribution function of electrons at finite voltage.