Excitonic funneling in extended dendrimers with nonlinear and random potentials

Citation
S. Raychaudhuri et al., Excitonic funneling in extended dendrimers with nonlinear and random potentials, PHYS REV L, 85(2), 2000, pp. 282-285
Citations number
25
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
2
Year of publication
2000
Pages
282 - 285
Database
ISI
SICI code
0031-9007(20000710)85:2<282:EFIEDW>2.0.ZU;2-A
Abstract
The mean first passage time (MFPT) for photoexcitations diffusion in a funn eling potential of artificial treelike light-harvesting antennas (phenylace tylene dendrimers with generation-dependent segment lengths) is computed. E ffects of the nonlinearity of the realistic funneling potential and slow ra ndom solvent fluctuations considerably slow down the center-bound diffusion beyond a temperature-dependent optimal size. Diffusion on a disordered Cay ley tree with a linear potential is investigated analytically. At low tempe ratures we predict a phase in which the MFPT is dominated by a few paths.