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Q: Fachverband Quantenoptik und Photonik

Q 37: Quantengase (Wechselwirkungseffekte I)

Q 37.3: Vortrag

Donnerstag, 13. März 2008, 11:30–11:45, 1C

Atom-molecule oscillations in a Mott insulator — •Matthias Lettner, Niels Syassen, Dominik M. Bauer, Daniel Dietze, Thomas Volz, Stephan Dürr, and Gerhard Rempe — Max Planck Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany

Near a Feshbach resonance an unbound state of two ultracold atoms is coherently coupled to a molecular one. This realizes a coupled two level system. We report on the observation of large-amplitude oscillations. The damping is so weak that 29 cycles are observed. The experiment uses ⁸⁷Rb in an optical lattice and a Feshbach resonance near 414 G. The frequency and amplitude of the oscillations depend on the magnetic field in a way that is well described by a two-level model. Also the observed density dependence of the oscillation frequency agrees with the theoretical expectation. We confirmed that the state produced after a half-cycle contains exactly one molecule at each lattice site. In addition, we show that for energies in a gap of the lattice band structure, the molecules cannot dissociate.

[1] N.Syassen PRL 99, 033201 (2007).