Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 12: Ultra-cold atoms, ions and BEC (with A)

Q 12.46: Poster

Monday, February 29, 2016, 16:30–19:00, Empore Lichthof

Towards high resolution imaging in a strongly imbalanced Bose Fermi mixture — •Alexander Mil, Fabian Olivares, Arno Trautmann, Marcell Gall, and Fred Jendrzejewski — Kirchhoff-Institut für Physik, Heidelberg, Deutschland

Strongly imbalanced Bose-Fermi mixtures are an ideal tool for the study of impurity problems, which are of great interest in modern condensed matter physics e.g. the polaron or the Kondo problem. A generic property of such systems is the screening cloud surrounding the impurity. While these screening clouds are central to the properties of most systems with impurities, they still remain hard to detect and to control. The current state of our experiment is well suited to tackle this problem. Using a mixture of bosonic sodium and fermionic lithium, with one of the species tightly trapped, leads to well localized impurities. Recent experiments on this system led to the observation of the phonon-induced lamb shift, which is characteristic for the presence of the screening cloud. Next goal is the direct observation of the screening cloud in real space.

We present our progress towards high resolution imaging in a sodium lithium mixture for direct observation of the screening cloud. Key feature here is a new imaging lens design enabling diffraction limited resolution for both species at a numerical aperture of 0.4. Moreover we elaborate on the imaging algorithm and the experimental setup allowing for high detection efficiencies.