Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster Quantengase

Q 64.15: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster C

Transport Properties in a Mott-like State of Molecules — •Niels Syassen, Dominik M. Bauer, Matthias Lettner, Daniel Dietze, Thomas Volz, Stephan Dürr, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany

In Ref. [1] we prepared a Mott-like quantum state of molecules. This state has exactly one molecule at each site of an optical lattice. We now study the transport properties in this state. The tunneling amplitude for a molecule J_m can bring two molecules to the same site. If this happens, then the molecules can collide inelastically, leading to loss of both molecules from the sample. This loss occurs with a rate coefficient Γ which is typically much faster than J_m/ℏ. The fast on-site loss leads to a suppression of tunneling. Loss from the initial state effectively occurs with a rate Γ_eff ∝ J_m²/Γ. This prediction agrees with our experimental results measured at different lattice depths. It shows that a fast on-site loss rate Γ can suppress tunneling in the Mott-like state, much like a strong on-site repulsion suppresses tunneling in a usual Mott insulator.

[1] T. Volz et al. Nature Physics 2, 692–695 (2006).