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Q: Fachverband Quantenoptik und Photonik

Q 52: Quantum gases: Fermions

Q 52.1: Group Report

Thursday, March 21, 2013, 14:00–14:30, F 342

Dynamical Properties of High-Spin Fermionic Quantum Gases — •Jasper Simon Krauser, Jannes Heinze, Nick Fläschner, Klaus Sengstock, and Christoph Becker — Universität Hamburg, Institut für Laserphysik, Luruper Chaussee 149, 22761 Hamburg, Germany

Ultracold fermions with large spin provide ideal model systems for high-spin magnetic properties beyond conventional electronic magnetism. Here, we report on extensive studies of fundamental spin and spin-spatial excitations in high-spin Fermi mixtures: Coherent multi-flavour spin dynamics in bulk systems and in 3d optical lattices, multi-component spin waves as well as the tuning of spin interactions via Feshbach resonances. As a key result we find that ultralow temperatures are essential for the coherent nature of spin dynamics. For our observations we find excellent agreement with theoretical models. Our results open new perspectives for further studies of high-spin magnetic properties such as S>1/2 Mott insulators or color superfluidity. This work is supported by DFG within FOR 801.