SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.34: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Ultracold Fermi Gases in Box Potentials — •Rene Henke, Hauke Biss, Cesar Cabrera, Lennart Sobirey, Niclas Luick, and Henning Moritz — Institute of Laserphysics, University of Hamburg, Hamburg, Germany

In the past years, our group has managed to create homogeneous ultracold Fermi gases of ⁶Li atoms, both in 2D and 3D trap geometries. Using Bragg spectroscopy, we measured the excitation spectrum in a momentum resolved fashion. This allowed us to observe superfluidity in the BEC-BCS crossover, to extract the superfluid gap and to compare 2D and 3D systems directly.
This poster will review some of these results and present our progress towards creating spin imbalanced mixtures in two dimensions. For these, many questions still remain unanswered, especially concerning the nature of a potential spin-polarized superfluid. One of the key questions in these systems is, whether the theoretically predicted but elusive FFLO phase exists. In this phase, fermions are theorized to form Cooper pairs with finite total momentum, due to the different Fermi momenta of spin majority and minority. More accessible open questions are whether a partially polarized superfluid can be observed in general, how stable it is and whether the transition between fully paired superfluid and partially polarized Fermi gas is of first or higher order.