title: Disorder-enhanced exciton delocalization in an extended dendrimer.
abstract: The exciton dynamics in a disordered extended dendrimer is investigated numerically. Because a homogeneous dendrimer exhibits few highly degenerate energy levels, a dynamical localization arises when the exciton is initially located on the periphery. However, it is shown that the disorder lifts the degeneracy and favors a delocalization-relocalization transition. Weak disorder enhances the delocalized nature of the exciton and improves any quantum communication, whereas strong disorder prevents the exciton from propagating in accordance with the well-known Anderson theory.
authors.affiliation: Institut UTINAM, Université de Franche-Comté, CNRS UMR 6213, 25030 Besançon Cedex, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Pouthier
mesh_terms: D050091:Dendrimers / Q000737:chemistry*; D008962:Models, Theoretical; D011336:Probability; D011789:Quantum Theory
chemical_list: D050091:Dendrimers