Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Gases: Fermions I
Q 4.2: Vortrag
Montag, 23. März 2015, 11:45–12:00, K/HS2
Exploring a strongly interacting 2D Fermi gas — •Mathias Neidig, Luca Bayha, Dhruv Kedar, Puneet Murthy, Martin Ries, Andre Wenz, Gerhard Zürn, and Selim Jochim — Physikalisches Institut, Universität Heidelberg
In this talk, we present our current progress investigating a strongly interacting cloud of paired ultracold 6Li-fermions in a strongly anisotropic confinement.
Our starting point is a quasi-2D gas of deeply bound bosonic dimers trapped in a single layer of a red-detuned standing wave trap. We are able to directly access the in-situ momentum distribution of this system and observe the emergence of a low-momentum condensate at low temperatures. From the momentum distribution, we extract a trap averaged g1 correlation function which for low temperatures shows a region of algebraically decaying phase. This hints towards a Berezinskii-Kosterlitz-Thouless (BKT)-like phase transition which is expected in a two-dimensional system.
Recently we added an optical square lattice to the setup and we are currently loading this BKT-type superfluid into this lattice. Progress on this will be reported.