title: Survival probabilities in coherent exciton transfer with trapping.
abstract: In the quest for signatures of coherent transport we consider exciton trapping in the continuous-time quantum walk framework. The survival probability displays different decay domains, related to distinct regions of the spectrum of the Hamiltonian. For linear systems and at intermediate times the decay obeys a power law, in contrast with the corresponding exponential decay found in incoherent continuous-time random walk situations. To differentiate between the coherent and incoherent mechanisms, we present an experimental protocol based on a frozen Rydberg gas structured by optical dipole traps.
authors.affiliation: Physikalisches Institut, Universität Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg i.Br., Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Mülken
authors.forename: Alexander
authors.initials: A
authors.lastname: Blumen
authors.forename: Thomas
authors.initials: T
authors.lastname: Amthor
authors.forename: Christian
authors.initials: C
authors.lastname: Giese
authors.forename: Markus
authors.initials: M
authors.lastname: Reetz-Lamour
authors.forename: Matthias
authors.initials: M
authors.lastname: Weidemüller