Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Quantengase: Fermionen im Gitter

Q 22.5: Talk

Tuesday, March 3, 2009, 15:15–15:30, VMP 6 HS-A

Static and dynamic properties of repulsivly interacting fermions in optical lattices — •Ulrich Schneider, Lucia Hackermüller, Thorsten Best, Sebastian Will, Simon Braun, and Immanuel Bloch — Johannes Gutenberg-Universität Mainz

Fermionic atoms in optical lattices can serve as a model system for condensed matter physics: They implement the Hubbard model with high experimental control of the relevant parameters. We study static and dynamic properties of ultracold Fermions in different regimes, ranging from metallic and band-insulating states in the non-interacting case to complex metals and the Fermionic-Mott-Insulator for strongly repulsive systems.

In the experiment, spin mixtures of fermionic ⁴⁰K are loaded into a combination of a blue detuned three dimensional optical lattice and a red detuned dipole trap. This combination of optical potentials allows an independent control of lattice depth and harmonic confinement, thus enabling us to explore different regimes. In addition to measurements of the in-situ cloud size and the doublon fraction we present measurements of the dynamic response of the system to changes in the external parameters.