title: Observation of strong quantum depletion in a gaseous Bose-Einstein condensate.
abstract: We studied quantum depletion in a gaseous Bose-Einstein condensate. An optical lattice enhanced the atomic interactions and modified the dispersion relation resulting in strong quantum depletion. The depleted fraction was directly observed as a diffuse background in the time-of-flight images. Bogoliubov theory provides a semiquantitative description for our observations of depleted fractions in excess of 50%.
authors.affiliation: Department of Physics, MIT-Harvard Center for Ultracold Atoms and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. kwxu@mit.edu
authors.forename: K
authors.initials: K
authors.lastname: Xu
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: D E
authors.initials: DE
authors.lastname: Miller
authors.forename: J K
authors.initials: JK
authors.lastname: Chin
authors.forename: W
authors.initials: W
authors.lastname: Setiawan
authors.forename: W
authors.initials: W
authors.lastname: Ketterle