title: Parametric amplification of matter waves in periodically translated optical lattices.
abstract: We observe the sudden growth of small classes of Bloch waves from atomic Bose-Einstein condensates held in periodically translated optical lattices. The effect is explained by narrowband parametric amplification of Bloch waves from noise, due to phase-matched scattering of atom pairs out of the condensate. Amplification occurs above a well-defined modulation threshold, described by dynamic shaping of single-particle band structure.
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: N
authors.initials: N
authors.lastname: Gemelke
authors.forename: E
authors.initials: E
authors.lastname: Sarajlic
authors.forename: Y
authors.initials: Y
authors.lastname: Bidel
authors.forename: S
authors.initials: S
authors.lastname: Hong
authors.forename: S
authors.initials: S
authors.lastname: Chu