title: Two-dimensional Bose-Einstein condensate in an optical surface trap.
abstract: We report on the creation of a two-dimensional Bose-Einstein condensate of cesium atoms in a gravito-optical surface trap. The condensate is produced a few microm above a dielectric surface on an evanescent-wave atom mirror. After evaporative cooling by all-optical means, expansion measurements for the tightly confined vertical motion show energies well below the vibrational energy quantum. The presence of a condensate is observed in two independent ways by a magnetically induced collapse at negative scattering length and by measurements of the horizontal expansion.
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
authors.forename: D
authors.initials: D
authors.lastname: Rychtarik
authors.forename: B
authors.initials: B
authors.lastname: Engeser
authors.forename: H-C
authors.initials: HC
authors.lastname: Nägerl
authors.forename: R
authors.initials: R
authors.lastname: Grimm