title: "Stückelberg interferometry" with ultracold molecules.
abstract: We report on the realization of a time-domain "Stückelberg interferometer", which is based on the internal-state structure of ultracold Feshbach molecules. Two subsequent passages through a weak avoided crossing between two different orbital angular momentum states in combination with a variable hold time lead to high-contrast population oscillations. This allows for a precise determination of the energy difference between the two molecular states. We demonstrate a high degree of control over the interferometer dynamics. The interferometric scheme provides new possibilities for precision measurements with ultracold molecules.
authors.affiliation: Institut für Experimentalphysik und Forschungszentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Mark
authors.forename: T
authors.initials: T
authors.lastname: Kraemer
authors.forename: P
authors.initials: P
authors.lastname: Waldburger
authors.forename: J
authors.initials: J
authors.lastname: Herbig
authors.forename: C
authors.initials: C
authors.lastname: Chin
authors.forename: H-C
authors.initials: HC
authors.lastname: Nägerl
authors.forename: R
authors.initials: R
authors.lastname: Grimm