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Q: Quantenoptik und Photonik

Q 4: Gruppenbericht Stark korrelierte Systeme

Q 4.1: Gruppenbericht

Montag, 13. März 2006, 11:10–11:40, HII

Strongly Correlated Fermionic Atoms in Optical Lattices — •Michael Köhl, Thilo Stöferle, Henning Moritz, Kenneth Günter, and Tilman Esslinger — Institut für Quantenelektronik, ETH Zürich, CH-8093 Zürich

We report on the realization of a strongly interacting quantum degenerate gas of fermionic atoms in a three-dimensional optical lattice. We prepare a band-insulating state for a two-component Fermi gas with one atom per spin state per lattice site. Using a Feshbach resonance, we induce strong interactions between the atoms. When sweeping the magnetic field from the repulsive side towards the attractive side of the Feshbach resonance we induce a coupling between Bloch bands leading to a transfer of atoms from the lowest band into higher bands. Sweeping the magnetic field across the Feshbach resonance from the attractive towards the repulsive side leads to two-particle bound states and ultimately to the formation of deeply bound molecules. From the fraction of formed molecules we determine the temperature of the atoms in the lattice.