Excitonic funneling in extended dendrimers with nonlinear and random potentials

2019-11-13 04:33:12

potential diffusion dependent dendrimers funneling

责任者: Raychandhuri, S.;Shapir, Y.;Chemyak, V.;Mukarnel, S. 单位: Dept. of Phys. & Astron., Rochester Univ., NY, USA 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2000/07/10,85(2):282-5 摘要: The mean first passage time (MFPT) for photoexcitation diffusion in a funneling potential of artificial treelike light-harvesting antennas (phenylacetylene dendrimers with generation-dependent segment lengths) is computed. Effects of the nonlinearity 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 关键词: excitons;fluctuations;nanostructured materials;organic compounds;photoexcitation;solvent effects;excitonic funneling;extended dendrimers;nonlinear potentials;random potentials;mean first passage time;photoexcitations diffusion;funneling potential;artificial treelike light-harvesting antennas;phenylacetylene dendrimers;generation-dependent segment lengths;nonlinearity;slow random solvent fluctuations;center-bound diffusion;temperature-dependent optimal size;disordered Cayley tree;linear potential;paths;nanomaterials