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Bulletin of the American Physical Society

Feshbach molecules and repulsively bound atom pairs in optical lattices

Gregor Thalhammer, Klaus Winkler, Florian J. W. Lang, Rudolf Grimm, Johannes Hecker Denschlag

Published May 19, 2006• 0 citations
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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 molecules. From the fraction of formed molecules we determine the temperature of the atoms in the lattice.