Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-17
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 12 figures
Scientific paper
10.1088/0953-8984/18/26/017
We present a detailed model study of exciton transfer processes in donor-bridge-acceptor (DBA) systems. Using a model which includes the intermolecular Coulomb interaction and the coupling to a dissipative environment we calculate the phase diagram, the absorption spectrum as well as dynamic equilibrium properties with the numerical renormalization group. This method is non-perturbative and therefore allows to cover the full parameter space, especially the case when the intermolecular Coulomb interaction is of the same order as the coupling to the environment and perturbation theory cannot be applied. For DBA systems up to six sites we found a transition to the localized phase (self-trapping) depending on the coupling to the dissipative environment. We discuss various criteria which favour delocalized exciton transfer.
Bulla Ralf
Tong Ning-Hua
Tornow Sabine
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