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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantengase: Gemische
Q 38.1: Vortrag
Mittwoch, 4. März 2009, 16:30–16:45, VMP 6 HS-A
Probing interaction effects in Bose-Fermi mixtures in optical lattices — •Thorsten Best1, Sebastian Will1, Simon Braun1, Ulrich Schneider1, Lucia Hackermüller1, Dirk-Sören Lühmann2, and Immanuel Bloch1 — 1Johannes Gutenberg-Unversität Mainz — 2Universität Hamburg
Mixtures of ultracold Bosons and Fermions in optical lattices are promising candidates for the investigation of intriguing complex quantum phases, some of which go beyond the scope of conventional condensed-matter systems. The key control parameter for the mixture, which is the strength of interspecies interaction, can conveniently be tuned in the experiment by means of an interspecies Feshbach resonance, combined with rapid hyperfine transitions in and out of the resonant collision channel.
The observation of the collapse and revival dynamics of a macroscopic bosonic matter wave field, and its modification by a fermionic admixture, provides copious information about the Bose-Fermi mixture. We extract how the interspecies interaction affects the occupation number statistics in the system. Moreover, we demonstrate the importance of orbital effects beyond the usual single-band picture, leading to a renormalization of the Hubbard parameters. A detailed understanding of these effects will be an important prerequisite for the preparation of complex many body quantum states in Bose-Fermi mixtures.