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Q: Fachverband Quantenoptik und Photonik

Q 32: Quantengase (Gitter III)

Q 32.3: Talk

Thursday, March 13, 2008, 09:00–09:15, 1C

In situ studies of ultracold fermions in a blue detuned optical lattice — •Ulrich Schneider, Lucia Hackermüller, Thorsten Best, Sebastian Will, Dries van Oosten, and Immanuel Blocj — Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany

Ultracold atoms in optical lattices are a versatile system to study topics ranging from ultracold molecules to solid state physics. The rich phase diagram of ultracold fermions in a lattice includes both metallic and insulating phases, e.g the fermionic Mott-Insulator and antiferromagnetically ordered states.

In our experiment we sympathetically cool fermionic ⁴⁰K with bosonic ⁸⁷Rb in an optically plugged quadrupole trap and subsequently in a dipole trap to quantum degeneracy. After removing the rubidium atoms from the trap, the fermionic ⁴⁰K is loaded into a blue detuned 3D optical lattice. The combination of a dipole trap and a blue lattice allows for an independent control of lattice depth and harmonic confinement. We use in situ imaging to study fermionic clouds in different regimes varying from noninteracting spinpolarized clouds to strongly interacting spin mixtures.