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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Gases I

Q 20.10: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

Pairing in a Mesoscopic 2D Fermi Gas — •Keerthan Subramanian, Marvin Holten, Luca Bayha, Sandra Brandstetter, Carl Heintze, Philipp Lunt, Philipp Preiss, and Selim Jochim — Physikaliches Insitut, Universität Heidelberg

Pairing in fermionic systems occurs at different length scales from Nuclei to condensed matter systems to neutron stars. The behavior of such disparate systems spanning several orders of magnitude in size can be understood by considering competing energy scales in the system - Fermi energy, confinement energy and Interaction energy - and their relation. In this poster we present a pristine model system with control over each of these energy scales.

Working in the few-body limit we deterministically prepare low entropy, closed shell configurations of fermionic 6Li atoms in a 2D harmonic oscillator potential. With a Feshbach resonance we tune the interaction energy and control how it relates to the other energy scales in the system. We observe the precursor of the many-body Normal-Superfluid quantum phase transition and the associated Higgs mode with interaction modulation spectroscopy. Spin-resolved microscopy of such a system reveals the formation of Cooper pairs in momentum space as interaction energy is tuned in the system.

Future directions including microscopy of such systems in position space with a matterwave microscope and spin-imbalanced systems are presented.