Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.70: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Spin Resolved Imaging of an Ultracold Fermi Gas in a 2D Optical Lattice — •Ralf Klemt, Luca Bayha, Puneet Murthy, Mathias Neidig, Martin Ries, Gerhard Zürn, and Selim Jochim — Physikalisches Institut, Universität Heidelberg, Germany

We report on the current status of our experiment investigating an ultracold, two-component ⁶Li Fermi gas in the BEC-BCS crossover, which is trapped in a 2D optical lattice. By using a matterwave focusing technique, we measure the momentum distribution which allows access to spatial coherence information. We realize both a transition from the normal to the superfluid phase and from the superfluid to an insulating phase by tuning the temperature and the lattice depth, respectively. For the insulating phase a loss of first-order correlations and phase coherence is expected. Probing the type of this insulating phase as well as observing spin-ordering requires to measure second-order, i.e. atom-noise, correlations.

Therefore a spin resolved two-state imaging has been implemented, which allows for recording both hyperfine states of the 6Li gas within a single experimental cycle. This was achieved combining fast current modulation of a diode laser and the interline transfer mode of a CCD camera. Hence the density profile of both spin components can be measured within 100µs, keeping the distortion between the images at a minimum. With this tool at hand the spatial atom-noise correlations between the different spin components can be obtained in addition to single spin correlations.