Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.16: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Characterization of a new broad Feshbach Resonance in 40K — •Maria Langbecker, Dominik Vogel, Jasper Simon Krauser, Nick Fläschner, Jannes Heinze, Sören Götze, Klaus Sengstock, and Christoph Becker — Universität Hamburg, Institut für Laser-Physik, Luruper Chaussee 149, 22761 Hamburg, Germany

Quantum gases offer a wide range of applications in the field of quantum simulation due to the high tunability of crucial system parameters. One important tool are Feshbach resonances which can be used to widely control the interaction between atoms by tuning their scattering lengths.

Here we report on different methods to characterize the position, width and zero crossing of a new broad Feshbach resonance in 40 K in a spin mixture of mf = +1/2, -1/2. We identify the resonance position to be centered at 389 G with a width of 26 G. We compare loss measurements with molecule formation and the emergence of spin waves. We find that our spin-wave meassurements constitute a well suited method to determine the position as well as the zero crossing of a Feshbach resonance.

Our results open the route for future studies of high-spin mixtures of fermionic Potassium. This work is supported by DFG within FOR 801.