Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 7: Quantengase: Fermionen

Q 7.1: Vortrag

Montag, 12. März 2012, 14:00–14:15, V47.02

Dynamics of multi-component fermions in optical lattices — •Jasper Simon Krauser, Jannes Heinze, Nick Fläschner, Sören Götze, Christoph Becker, and Klaus Sengstock — Universität Hamburg, Institut für Laser-Physik, Luruper Chaussee 149, 22761 Hamburg, Germany

Quantum gases in optical lattices offer a wide range of applications for quantum simulation due to the full control over lattice and interaction parameters as well as the internal atomic degrees of freedom. In our setup, we produce different interacting spin-mixtures of fermionic potassium atoms and load them into an optical lattice. The atoms behave similar to electrons in a crystal. However, in contrast to electrons with spin-1/2, we use ⁴⁰K with a higher spin, which has important effects on the properties of the system. The atomic ensemble is quenched from a polarized to a non-polarized regime and the resulting dynamics are recorded. We compare our data to a theoretical calculation. In the latter, we assume a simplified two-particle model which is in very good agreement with our observations. Our results open new perspectives to study magnetism of fermionic lattice systems beyond conventional spin-1/2 systems.