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A: Fachverband Atomphysik

A 13: Quantum Gases and Matter Waves (joint session Q/A)

A 13.15: Poster

Dienstag, 21. September 2021, 16:30–18:30, P

Observation of Cooper pairs in a few-body system — Marvin Holten, Luca Bayha, •Keerthan Subramanian, Sandra Brandstetter, Carl Heintze, Philipp Preiss, and Selim Jochim — Physikalisches Institut der Universität Heidelberg, Heidelberg, Germany

Recent advances in deterministic preparation of few-body systems have led to the observation of an emergence of a quantum phase transition [1] and single particle detection methods have resulted in the first observation of Pauli crystals [2] demonstrating correlations in a non-interacting system due to quantum statistics.

In this poster we present the first direct observation of Cooper pairs in a few-body system of ⁶Li atoms. We deterministically prepare low entropy samples of a two-component Fermi gas in a 2D harmonic oscillator potential and directly observe the full spin and single particle resolved momentum distribution enabling us to extract correlation functions of any order. We demonstrate the crossover from no pairing to Cooper-pairing at the Fermi surface to softening of the Fermi surface and pairing at all momenta as the interaction is increased.

In the future we plan to extend our imaging scheme to obtain single atom resolved images of the in-situ cloud [3]. This would allow us to tackle questions related to 2D Fermi superfluids concerning the nature of the normal phase and pairing in spin-imbalanced systems.

[1] L. Bayha, et al. Nature 587.7835 (2020): 583-587.

[2] M. Holten, et al. Physical Review Letters 126.2 (2021): 020401

[3] L. Asteria, et al. arXiv:2104.10089 (2021).