Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 33: Transport - Nanoelectronics III: Molecular Electronics

TT 33.14: Vortrag

Dienstag, 8. März 2005, 17:30–17:45, TU H3027

Electron and Exciton Transfer in Donor-Acceptor Systems: Many-Particle Effects and Influence of Electronic Correlations — •Sabine Tornow, Ning-Hua Tong, and Ralf Bulla — Theoretische Physik III, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany

The spin boson model provides a well established description of electron transfer processes from a donor to an acceptor. The redox sites are modelled by two localized quantum states. This picture breaks down in multi electron transfer processes if many particle effects and electron correlations have to be taken into account. We present a theoretical non-perturbative study of the electron and exciton transfer based on an extended spin boson model where the redox sites are modelled more realistically. Using Wilsons Numerical Renormalization Group method we discuss effects of the electron correlations on the transfer rate.