title: Observation of phase defects in quasi-two-dimensional Bose-Einstein condensates.
abstract: We have observed phase defects in quasi-2D Bose-Einstein condensates close to the condensation temperature. Either a single or several equally spaced condensates are produced by selectively evaporating the sites of a 1D optical lattice. When several clouds are released from the lattice and allowed to overlap, dislocation lines in the interference patterns reveal nontrivial phase defects.
authors.affiliation: Laboratoire Kastler Brossel, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Sabine
authors.initials: S
authors.lastname: Stock
authors.forename: Zoran
authors.initials: Z
authors.lastname: Hadzibabic
authors.forename: Baptiste
authors.initials: B
authors.lastname: Battelier
authors.forename: Marc
authors.initials: M
authors.lastname: Cheneau
authors.forename: Jean
authors.initials: J
authors.lastname: Dalibard