Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 4: Quantum gases (Fermions) I

Q 4.6: Talk

Monday, March 9, 2020, 12:15–12:30, e214

Assembling a Strongly Correlated Fermi Superfluid one Atom at a Time — •Marvin Holten, Luca Bayha, Keerthan Subramanian, Carl Heintze, Philipp Preiss, and Selim Jochim — Physics Institute, University of Heidelberg, Germany

Strong correlations between Fermions lie at the heart of many open questions concerning quantum matter that remain unresolved to this day. Examples are quark gluon plasmas, strange metals or high temperature superconductors. Effective descriptions of such systems in terms of weakly interacting constituents are unknown and the strong fermionic correlations must be considered.

In our experiment, we take a novel approach to study a strongly interacting two-dimensional Fermi superfluid by starting from very small systems, prepared deterministically in the ground state. We find evidence for the presence of a few body precursor of the superfluid phase transition and study its dependence on particle number. In this talk, I present first results obtained by applying a time-of-flight imaging technique, both spin and single particle resolved, to this system. This enables us to extract arbitrary N-body correlations of our many-body state. First measurements reveal strong high-order momentum correlations even between identical, non-interacting, Fermions. These manifest due to Pauli's principle, leading to particular geometric arrangements of trapped Fermions also referred to as Pauli Crystals.

We plan to extend these measurements to both interacting systems and larger particle numbers in the future to tackle the issue of the pairing mechanism in strongly interacting Fermi gases.