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A: Fachverband Atomphysik

A 24: Atomic Clusters IV

A 24.1: Hauptvortrag

Freitag, 12. März 2010, 10:30–11:00, F 303

Interacting Bosonic and Fermionic Atoms in 3D Optical Lattice Potentials — •Sebastian Will, Thorsten Best, Simon Braun, Philipp Ronzheimer, Ulrich Schneider, Michael Schreiber, Kin Chung Fong, Lucia Hackermüller, and Immanuel Bloch — Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799 München, Germany

In recent years, ultracold atoms in optical lattices have begun to reveal their potential to simulate condensed matter systems with the exceptional control offered by atomic physics. We perform experiments directed towards quantum simulation using ultracold bosonic ⁸⁷Rb and fermionic ⁴⁰K atoms loaded to a 3D optical lattice, that features tunability of the underlying harmonic confinement. Additionally harnessing intra- and interspecies Feshbach resonances as a direct control knob for interactions, we investigate strongly interacting quantum systems along several routes: Using repulsively interacting ⁴⁰K Fermi-Fermi mixtures we have been able to realize an implementation of the Fermi Hubbard model. A direct measurement of compressibility allowed us to identify metallic, Fermi liquid and band insulating phases as well as an emergent Mott insulating phase. In ⁸⁷Rb-⁴⁰K Bose-Fermi mixtures we have characterized the shift of the bosonic superfluid to Mott insulating transition finding interaction-induced self-trapping to be the dominant cause. Recently, we have been able to peek beyond the single-band Hubbard model in a purely bosonic ⁸⁷Rb system: A precision measurement of the absolute interaction energies on the sites of a deep optical lattice revealed the presence of coherent multi-body interactions.