Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Poster: Quantum gases, ultracold atoms and molecules
Q 32.22: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Experimental setup to probe a strongly interacting quasi two-dimensional Fermi gas — •Sebastian Pres1, Martin Ries1, Mathias Neidig1, Andre Wenz1, Puneet Murthy1, Gerhard Zürn1, Thomas Lompe2, and Selim Jochim1 — 1Physikalisches Institut, Universität Heidelberg, INF 226, 69120 Heidelberg, Germany — 2Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA
We present our setup to probe a quasi two-dimensional gas of ultracold fermions in the strongly interacting regime.
We prepare a quantum degenerate quasi-2D sample of 6Li atoms in the two lowest hyperfine states by performing evaporative cooling in an optical dipole trap and subsequently transferring the cloud into a standing wave optical dipole trap. The standing wave trap creates a stack of oblate potentials with a tight vertical confinement. Using radio-frequency tomography we can determine how many of the layers of the standing wave trap we populate and thus show that we can prepare a single realization of a quasi-2D Fermi gas by loading the sample into a single layer of the trap.
We use a matter wave focussing technique to directly access the initial in-situ radial momentum distribution of the sample in the trap. In the bosonic limit of deeply bound molecules, we observe a clear bimodal distribution which hints towards the formation of a quasi condensate. Evaluating this system as a function of interaction strength and temperature, we are able to investigate the 2D equivalent of the BEC-BCS crossover.