Stuttgart 2012 – wissenschaftliches Programm
Q 34.20: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II
Feshbach Resonances in 40K — •Jasper Simon Krauser, Jannes Heinze, Nick Fläschner, Sören Götze, Christoph Becker, and Klaus Sengstock — Universität Hamburg, Institut für Laser-Physik, Luruper Chaussee 149, 22761 Hamburg, Germany
Quantum gases offer a wide range of applications for quantum simulation due to the high tunability of the crucial experimental parameters. Especially Feshbach resonances have been proven to be an essential tool to control the atomic interaction in ultracold quantum gases and have found numerous applications in Bose-Einstein condensates as well as in degenerate Fermi gases. Here, we explore Feshbach resonances in different homonuclear mixtures of 40K within the f=9/2 hyperfine manifold. In the experiment, we prepare binary spin mixtures in an optical dipole trap and investigate atomic losses at different magnetic fields. We study mixtures, which are stable or unstable against spin relaxations, and observe a variety of Feshbach resonances in good agreement with theoretical predictions. Within stable channels, the resonances are associated with low loss rates. In the spin mixture mf1,f2=1/2,−1/2 a resonance at 384.5 G with a width of 26 G is reported, which could serve as an intriguing tool for future experiments due to its large width. Combining different Feshbach resonances opens the route to study triple mixtures of Potassium with independent control of the interaction.