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Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.16: Poster

Thursday, March 11, 2010, 16:00–19:00, Lichthof

Interacting Bose-Fermi Mixtures in Optical Lattices — •Simon Braun1, Sebastian Will1, Thorsten Best2, Philipp Ronzheimer1, Michael Schreiber1, Ulrich Schneider1, Tim Rom1, Lucia Hackermüller1, Kin-Chung Fong1, Dirk-Sören Lühmann3, and Immanuel Bloch11Ludwig-Maximilians-Universität München — 2ALU Freiburg — 3Universität Hamburg

Mixtures of ultracold quantum gases in optical lattices form novel quantum many-body systems, whose properties are governed by an intriguing interplay of quantum statistics, inter- and intraspecies interactions, as well as the relative atom numbers of the constituents.

In our setup, we cool bosonic 87Rb and fermionic 40K to simultaneous quantum degeneracy. We realize a Bose-Fermi Hubbard model (BFHM) by loading the atoms into the combined potential of a blue-detuned three-dimensional optical lattice and a red-detuned dipole trap. The interspecies interactions can be controlled using Feshbach resonances and Raman transitions between different Zeeman sublevels.

Our investigations of the many-body properties of the Bose-Fermi mixture revealed that attractive interspecies interactions cause a marked shift in the superfluid to Mott insulator transition due to self-trapping. In a detailed study of quantum phase diffusion of a BEC in a 3D optical lattice, we were able to measure the bosonic interaction energies with very high precision and observe the influence of a fermionic admixture on both the occupation number statistics and the BFHM parameters. Finally, we present routes towards the realization of polaron physics in atomic Bose-Fermi mixtures.

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