title: Evidence of Positronium Bloch states in porous crystals of Zn4O-coordination polymers.
abstract: Positronium (Ps) is shown to exist in a delocalized state in self-assembled metalorganic crystals that have large 1.3-1.5 nm cell sizes. Belonging to a class of materials with record high accessible specific surface areas, these highly porous crystals are the first to allow direct probing with simple annihilation lifetime techniques of the transport properties of long-lived triplet Ps in what is hypothesized to be a Bloch state. Delocalized Ps has unprecedented (high) Ps mobility driven primarily by weak phonon scattering with unusual and profound consequences on how Ps probes the lattice.
authors.affiliation: Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, USA.
authors.forename: Dhanadeep
authors.initials: D
authors.lastname: Dutta
authors.forename: Jeremy I
authors.initials: JI
authors.lastname: Feldblyum
authors.forename: David W
authors.initials: DW
authors.lastname: Gidley
authors.forename: James
authors.initials: J
authors.lastname: Imirzian
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Matzger
authors.forename: Richard S
authors.initials: RS
authors.lastname: Vallery
authors.forename: Antek G
authors.initials: AG
authors.lastname: Wong-Foy