Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 56: Quantengase (Fermionen und Gemische)
Q 56.4: Talk
Thursday, March 22, 2007, 14:45–15:00, 6J
Interacting Fermions in a 3D Optical Lattice — •Niels Strohmaier1, Kenneth Günter1, Yosuke Takasu1, Henning Moritz1, Michael Köhl1,2, and Tilman Esslinger1 — 1Institute of Quantum Electronics, ETH Zürich, CH-8093 Zürich, Switzerland — 2Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
The Fermi-Hubbard model, which is an important element of modern condensed matter theory, can be experimentally explored with fermionic atoms in optical lattices. A particularly appealing feature is the capability to change smoothly from non-interacting to attractive or repulsive interactions by accessing a Feshbach scattering resonance. In the strongly repulsive case, one expects the formation of a fermionic Mott insulator state with reduced number fluctuations on each site. For attractive interactions superfluidity is predicted.
In our experiment, we prepare a spin mixture of ultracold fermions in a three-dimensional optical lattice at various filling factors. Recent results concerning the behaviour of the system for attractive as well as repulsive interactions will be presented.