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Q: Fachverband Quantenoptik und Photonik

Q 56: Quantum Gases: Fermions II

Q 56.3: Vortrag

Donnerstag, 9. März 2023, 15:00–15:15, F342

A mesoscopic fluid of 10 fermions — •Sandra Brandstetter, Philipp Lunt, Carl Heintze, Jonas Herkel, Marvin Holten, Keerthan Subramanian, Philipp Preiss, and Selim Jochim — Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany

A striking manifestation of collective behaviour is the emergence of hydrodynamics, the effective description of a system as a fluid. In addition to classical systems, hydrodynamic expansion has been observed in different many-body quantum systems, ranging from heavy ion collisions to ultracold quantum gases. However the emergence of hydrodynamics in the mesoscopic limit is still unexplored. Our cold atom experiment opens up new pathways starting from the smallest scales with deterministic control over the atom number and interaction strength. We observe the inversion of the initial aspect ratio after an interacting expansion - a signature of hydrodynamics - in a system comprised of only 10 particles.

We prepare few fermionic 6Li atoms in 2 different spin states in the ground state of an elliptical 2D trap. A sudden switch off of the confining potential in radial direction leads to an expansion in a 2D plane, which we perform at different interaction strengths. Our spin and single atom resolved imaging technique allows us to study correlations of any order between atoms. Two different matterwave magnification techniques provide access to momentum or real space at different times during the expansion, such that we can directly observe the inversion of the aspect ratio.