SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.39: Poster

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

Feshbach molecules in an orbital optical lattice — •Max Hachmann, Yann Kiefer, and Andreas Hemmerich — Institut für Laserphysik, Universität Hamburg

We experimentally study strongly interacting degenerate Fermi gases exposed to an optical lattice. As a first benchmark, Kapitza-Dirac scattering at a 1D-optical standing wave is used to probe coherence properties of different atomic samples, including a strongly interacting Fermi gas spanning the whole BEC-BCS crossover regime. Adjusting the magnetic field in the vicinity of a Feshbach resonance allowed to create bosonic dimers formed by two fermionic 40K atoms, which are also studied in the optical lattice. Using a bipartite optical square lattice ultimately resulted in the successful selective population of higher Bloch bands, which are then analysed by means of a method resembling mass spectrometry. Binding energies and lifetimes in the second (first) Bloch band were extensively studied, where the longest lifetimes are observed at the onset of unitarity with values around 100ms(300ms). Our work prepares the stage for orbital BEC-BCS crossover physics.