Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.32: Poster

Tuesday, March 12, 2024, 17:00–19:00, KG I Foyer

Observation of hydrodynamics and pairing in a few-fermion system — •Sandra Brandstetter, Carl Heintze, Karen Wadenpfuhl, Philipp Lunt, Keerthan Subramanian, Marvin Holten, Maciej Galka, and Selim Jochim — Universität Heidelberg, Heidelberg, Germany

Fermionic quantum systems, adjustable in atom numbers, are our tool to explore emergent many-body phenomena. Our experimental setup allows the deterministic preparation of 6Li atoms in the ground state of a two-dimensional harmonic potential.

We use matter wave magnification techniques to measure individual atoms' positions or momenta. Previous experiments unveiled phase transitions [1] and Cooper pairs [2].

In our experiments we observe elliptic flow in systems as small as 10 particles, challenging the traditional understanding of hydrodynamics [3]. Presently, we're focused on exploring the transition from a two-particle bound state to the many-body Cooper pairs using our ability to access real space correlations.

Future objectives include extracting the contact parameter, studying open shell configurations akin to nuclear physics, and observing interference among identical few-body systems.

[1]Bayha et al. Nature 587 (2020)

[2]Holten et al. Nature 606 (2022)

[3]Brandstetter et al. arXiv: 2308.09699v1 (2023)

Keywords: Fermions; Ultracold; Hydrodynamics; Cooper Pairs; Few-body