Excitonic Funneling in Extended Dendrimers with Non-Linear and Random Potentials

Details Excitonic Funneling in Extended Dendrimers with Non-Linear and Random Potentials Excitonic Funneling in Extended Dendrimers with Non-Linear and Random Potentials

2000-06-28

arxiv.org/abs/cond-mat/0006452v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures, To be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.282

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.

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