Excitonic Funneling in Extended Dendrimers with Non-Linear and Random Potentials
Disordered Systems and Neural Networks
2009-10-31 v1 Chemical Physics
Abstract
The mean first passage time (MFPT) for photoexcitations diffusion in a funneling potential of artificial tree-like light-harvesting antennae (phenylacetylene dendrimers with generation-dependent segment lengths) is computed. Effects of the non-linearity of the realistic funneling potential and slow random solvent fluctuations considerably slow down the center-bound diffusion beyond a temperature-dependent optimal size. Diffusion on a disordered Cayley tree with a linear potential is investigated analytically. At low temperatures we predict a phase in which the MFPT is dominated by a few paths.
Cite
@article{arxiv.cond-mat/0006452,
title = {Excitonic Funneling in Extended Dendrimers with Non-Linear and Random Potentials},
author = {Subhadip Raychaudhuri and Yonathan Shapir and Vladimir Chernyak and Shaul Mukamel},
journal= {arXiv preprint arXiv:cond-mat/0006452},
year = {2009}
}
Comments
4 pages, 4 figures, To be published in Phys. Rev. Lett