title: Quantum effects on liquid dynamics as evidenced by the presence of well-defined collective excitations in liquid para-hydrogen
abstract: The origin of the well-defined collective excitations found in liquid para-H2 by recent experiments is investigated. The persistence of their relatively long lifetimes down to microscopic scales is well accounted for by calculations carried out by means of path-integral-centroid molecular dynamics. In contrast only overdamped excitations are found in calculations carried within the classical limit. The results provide fully quantitative evidence of quantum effects on the dynamics of a simple liquid.
authors.affiliation: Consejo Superior de Investigaciones Cientificas, Serrano 121-123, E-28006 Madrid, Spain.
authors.initials: FJ
authors.lastname: Bermejo
authors.initials: K
authors.lastname: Kinugawa
authors.initials: C
authors.lastname: Cabrillo
authors.initials: SM
authors.lastname: Bennington
authors.initials: B
authors.lastname: Fak
authors.initials: MT
authors.lastname: Fernandez-Diaz
authors.initials: P
authors.lastname: Verkerk
authors.initials: J
authors.lastname: Dawidowski
authors.initials: R
authors.lastname: Fernandez-Perea