title: Bose-Einstein condensate in an optical lattice with tunable spacing: transport and static properties.
abstract: In this Letter we report the investigation of transport and static properties of a Bose-Einstein condensate in a large-spaced optical lattice. The lattice spacing can be easily tuned starting from few micrometers by adjusting the relative angle of two partially reflective mirrors. We have performed in-situ imaging of the atoms trapped in the potential wells of a 20 microm spaced lattice. For a lattice spacing of 10 microm we have studied the transport properties of the system and the interference pattern after expansion, evidencing quite different results with respect to the physics of BECs in ordinary near-infrared standing wave lattices, owing to the different length and energy scales.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Fallani
authors.forename: Chiara
authors.initials: C
authors.lastname: Fort
authors.forename: Jessica
authors.initials: J
authors.lastname: Lye
authors.forename: Massimo
authors.initials: M
authors.lastname: Inguscio