2008/08/31 by C. Ospelkaus, C Ospelkaus, S. Ospelkaus +1
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Cold Atom Physics and Bose-Einstein Condensates #Topological Materials and Phenomena #cond-mat.other #cond-mat.stat-mech #physics.atom-ph
paper · pdf · doi:10.1088/0953-4075/41/20/203001
published as J. Phys. B: At. Mol. Opt. Phys. 41, 203001 (2008) · 72 pages, updated to published version
openalex publication_date 2008/10/01 · arxiv created 2008/10/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this PhD tutorial article, we present experiments with quantum degenerate mixtures of fermionic and bosonic atoms in 3-dimensional optical lattices. This heteronuclear quantum gas mixture offers a wide range of possibilities for quantum simulation, implementation of condensed matter Hamiltonians, quantum chemistry and ultimately dense and quantum degenerate dipolar molecular samples. We show how quantum degenerate mixtures of 40 K and 87 Rb are created in the experiment. We analyze stages of evaporative cooling and show how a dynamic mean field collapse occurs during the final stage of the evaporation [1] as a result of attractive interactions. The particle numbers observed in our experiment have only been limited by this mean field collapse, resulting in an excellent starting point for our experiments. We explore magnetic field induced Feshbach resonances and demonstrate tuning of interactions [2] between 40 K and 87 Rb by means of heteronuclear Feshbach resonances. We observe both stable attractively and repulsively interacting mixtures. We analyze the mean field energy of the condensate and find qualitative agreement with a simple model. By making the interaction strong and attractive, we induce a mean field collapse