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

» presentations   » 2005.03.04-09

Electron-phonon coupling mechanisms in molecular electron transport (TT 33.6 Di 15:15 TU H3027)

M. Hartung and G. Cuniberti

Deutsche Physikalische Gesellschaft, AKF Frühjahrstagung 2005
German Physical Society, Spring Meeting 2005

2005.03.04-09; Berlin, Germany

We study the conductance through a single vibrating molecule contacted to two metallic electrodes. The starting point is a tight-binding Hamiltonian with a linear coupling of the ionic motion to the electronic degrees of freedom. We distinguish between a coupling to the onsite energy of the molecule and a coupling representing a bond-stretching vibrational mode. The full nonequilibrium current, shot noise, and dissipated power is calculated within the Keldysh Green function formalism. As far as transport observables are concerned, onsite and bond-stretching coupling mechanisms differ in several respects: In the latter case satellite peaks in the differential conductance are more pronounced and results closer to the experimental evidence can be obtained.

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